{"id":"CVE-2021-25216","aliases":["ALPINE-CVE-2021-25216","BELL-CVE-2021-25216","CLSA-2021-1632261705","CLSA-2021-1634922250","DEBIAN-CVE-2021-25216","DLA-2647-1","DSA-4909-1","EUVD-2021-12127","GHSA-4vh7-r4m9-4w3v","MGASA-2021-0220","SUSE-SU-2021:1469-1","SUSE-SU-2021:14714-1","UBUNTU-CVE-2021-25216","USN-4929-1","USN-7739-1","openSUSE-SU-2024:10650-1"],"status":"published","title":"A second vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a buffer overflow attack","description":"In BIND 9.5.0 -\u003e 9.11.29, 9.12.0 -\u003e 9.16.13, and versions BIND 9.11.3-S1 -\u003e 9.11.29-S1 and 9.16.8-S1 -\u003e 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.1 of the BIND 9.17 development branch, BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND's default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting values for the tkey-gssapi-keytab or tkey-gssapi-credential configuration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. For servers that meet these conditions, the ISC SPNEGO implementation is vulnerable to various attacks, depending on the CPU architecture for which BIND was built: For named binaries compiled for 64-bit platforms, this flaw can be used to trigger a buffer over-read, leading to a server crash. For named binaries compiled for 32-bit platforms, this flaw can be used to trigger a server crash due to a buffer overflow and possibly also to achieve remote code execution. We have determined that standard SPNEGO implementations are available in the MIT and Heimdal Kerberos libraries, which support a broad range of operating systems, rendering the ISC implementation unnecessary and obsolete. Therefore, to reduce the attack surface for BIND users, we will be removing the ISC SPNEGO implementation in the April releases of BIND 9.11 and 9.16 (it had already been dropped from BIND 9.17). We would not normally remove something from a stable ESV (Extended Support Version) of BIND, but since system libraries can replace the ISC SPNEGO implementation, we have made an exception in this case for reasons of stability and security.","severity":{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.82992,"percentile":0.99679,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-125","CWE-190","CWE-617"],"published":"2021-04-28T00:00:00Z","modified":"2026-10-24T10:30:52Z","fixes":[{"ecosystem":"Alpine:v3.10","package":"bind","fixed_in":["9.16.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.11","package":"bind","fixed_in":["9.16.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.12","package":"bind","fixed_in":["9.16.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"bind","fixed_in":["9.16.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"bind","fixed_in":["9.16.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"bind","fixed_in":["9.16.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"bind","fixed_in":["9.16.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"bind","fixed_in":["9.16.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"bind","fixed_in":["9.16.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"bind","fixed_in":["9.16.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"bind","fixed_in":["9.16.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"bind","fixed_in":["9.16.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"bind","fixed_in":["9.16.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"bind","fixed_in":["9.16.15-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"bind","fixed_in":["9.16.15-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"bind9","fixed_in":["1:9.16.15-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"bind9","fixed_in":["1:9.16.15-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"bind9","fixed_in":["1:9.16.15-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:14.04:LTS","package":"bind9","fixed_in":["1:9.9.5.dfsg-3ubuntu0.19+esm13"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"bind9","fixed_in":["1:9.10.3.dfsg.P4-8ubuntu1.19"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"bind9","fixed_in":["1:9.11.3+dfsg-1ubuntu1.15"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"bind9","fixed_in":["1:9.16.1-0ubuntu2.8"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.10","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.16.15-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.11","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.16.15-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.12","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.16.15-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.13","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.16.15-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.14","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.16.15-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.15","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.16.15-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.16","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.16.15-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.17","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.16.15-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.18","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.16.15-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.19","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.16.15-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.20","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.16.15-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.16.15-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.16.15-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.16.15-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.16.15-r0"}]}]},{"source":"osv","ecosystem":"TuxCare:CentOS:6","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"33:9.8.2-0.68.rc1.el6_10.10.cloudlinux.els"}]}],"bundled":3},{"source":"osv","ecosystem":"T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Applicable","web"]},{"url":"http://www.openwall.com/lists/oss-security/2021/04/29/1","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2021/04/29/2","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2021/04/29/3","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2021/04/29/4","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"https://www.debian.org/security/2021/dsa-4909","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred","Third Party Advisory","advisory"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/05/msg00001.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20210521-0006/","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory"]},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-21-657/","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","VDB Entry","advisory"]},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25216"},{"url":"https://github.com/advisories/GHSA-4vh7-r4m9-4w3v"},{"url":"https://security.alpinelinux.org/vuln/CVE-2021-25216","tags":["advisory"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2021-25216","tags":["advisory"]},{"url":"https://errata.cloudlinux.com/els6/CLSA-2021-1632261705.html","tags":["advisory"]},{"url":"https://errata.cloudlinux.com/ol6/CLSA-2021-1634922250.html","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-25216","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2021-0220.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=28873","tags":["report"]},{"url":"https://access.redhat.com/errata/RHSA-2021:1469","tags":["web"]},{"url":"https://kb.isc.org/v1/docs/cve-2021-25214","tags":["web"]},{"url":"https://kb.isc.org/v1/docs/cve-2021-25216","tags":["web"]},{"url":"https://www.openwall.com/lists/oss-security/2021/04/29/1","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2021/suse-su-20211469-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1181495","tags":["report"]},{"url":"https://bugzilla.suse.com/1185345","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2021-25214","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-25215","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-25216","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2021/suse-su-202114714-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-25216","tags":["report"]},{"url":"https://kb.isc.org/docs/cve-2021-25216","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4929-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-25216","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-7739-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-25214","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-25215","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2006-4339","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2007-2925","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2007-2926","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-8461","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-2775","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9131","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9778","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-3135","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-3141","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-3142","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-3145","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-5737","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-5743","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-5745","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-6465","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-6471","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-6476","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-6477","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8616","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8617","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8618","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8619","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8620","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8621","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8622","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8623","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8624","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8625","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-25218","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2021-25216","title":"A second vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a buffer overflow attack","description":"In BIND 9.5.0 -\u003e 9.11.29, 9.12.0 -\u003e 9.16.13, and versions BIND 9.11.3-S1 -\u003e 9.11.29-S1 and 9.16.8-S1 -\u003e 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.1 of the BIND 9.17 development branch, BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND's default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting values for the tkey-gssapi-keytab or tkey-gssapi-credential configuration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. For servers that meet these conditions, the ISC SPNEGO implementation is vulnerable to various attacks, depending on the CPU architecture for which BIND was built: For named binaries compiled for 64-bit platforms, this flaw can be used to trigger a buffer over-read, leading to a server crash. For named binaries compiled for 32-bit platforms, this flaw can be used to trigger a server crash due to a buffer overflow and possibly also to achieve remote code execution. We have determined that standard SPNEGO implementations are available in the MIT and Heimdal Kerberos libraries, which support a broad range of operating systems, rendering the ISC implementation unnecessary and obsolete. Therefore, to reduce the attack surface for BIND users, we will be removing the ISC SPNEGO implementation in the April releases of BIND 9.11 and 9.16 (it had already been dropped from BIND 9.17). We would not normally remove something from a stable ESV (Extended Support Version) of BIND, but since system libraries can replace the ISC SPNEGO implementation, we have made an exception in this case for reasons of stability and security.","status":"published","published":"2021-04-29T00:55:17.362Z","modified":"2024-09-16T22:25:23.581Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:32:59.802172Z"}],"euvd":[{"id":"EUVD-2021-12127","description":"In BIND 9.5.0 -\u003e 9.11.29, 9.12.0 -\u003e 9.16.13, and versions BIND 9.11.3-S1 -\u003e 9.11.29-S1 and 9.16.8-S1 -\u003e 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.1 of the BIND 9.17 development branch, BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND's default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting values for the tkey-gssapi-keytab or tkey-gssapi-credential configuration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. For servers that meet these conditions, the ISC SPNEGO implementation is vulnerable to various attacks, depending on the CPU architecture for which BIND was built: For named binaries compiled for 64-bit platforms, this flaw can be used to trigger a buffer over-read, leading to a server crash. For named binaries compiled for 32-bit platforms, this flaw can be used to trigger a server crash due to a buffer overflow and possibly also to achieve remote code execution. We have determined that standard SPNEGO implementations are available in the MIT and Heimdal Kerberos libraries, which support a broad range of operating systems, rendering the ISC implementation unnecessary and obsolete. Therefore, to reduce the attack surface for BIND users, we will be removing the ISC SPNEGO implementation in the April releases of BIND 9.11 and 9.16 (it had already been dropped from BIND 9.17). We would not normally remove something from a stable ESV (Extended Support Version) of BIND, but since system libraries can replace the ISC SPNEGO implementation, we have made an exception in this case for reasons of stability and security.","status":"published","published":"2021-04-29T00:55:17Z","modified":"2024-09-16T22:25:23Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T00:55:02.946444Z"}],"ghsa":[{"id":"GHSA-4vh7-r4m9-4w3v","title":"In BIND 9.5.0 -\u003e 9.11.29, 9.12.0 -\u003e 9.16.13, and versions BIND 9.11.3-S1 -\u003e 9.11.29-S1 and 9.16.8...","description":"In BIND 9.5.0 -\u003e 9.11.29, 9.12.0 -\u003e 9.16.13, and versions BIND 9.11.3-S1 -\u003e 9.11.29-S1 and 9.16.8-S1 -\u003e 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.1 of the BIND 9.17 development branch, BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND's default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting values for the tkey-gssapi-keytab or tkey-gssapi-credential configuration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. For servers that meet these conditions, the ISC SPNEGO implementation is vulnerable to various attacks, depending on the CPU architecture for which BIND was built: For named binaries compiled for 64-bit platforms, this flaw can be used to trigger a buffer over-read, leading to a server crash. For named binaries compiled for 32-bit platforms, this flaw can be used to trigger a server crash due to a buffer overflow and possibly also to achieve remote code execution. We have determined that standard SPNEGO implementations are available in the MIT and Heimdal Kerberos libraries, which support a broad range of operating systems, rendering the ISC implementation unnecessary and obsolete. Therefore, to reduce the attack surface for BIND users, we will be removing the ISC SPNEGO implementation in the April releases of BIND 9.11 and 9.16 (it had already been dropped from BIND 9.17). We would not normally remove something from a stable ESV (Extended Support Version) of BIND, but since system libraries can replace the ISC SPNEGO implementation, we have made an exception in this case for reasons of stability and security.","status":"published","published":"2022-05-24T17:49:12Z","modified":"2023-01-29T05:07:28Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-125","CWE-190","CWE-617"],"updated_at":"2026-11-02T14:46:10.15423Z"}],"nvd":[{"id":"CVE-2021-25216","description":"In BIND 9.5.0 -\u003e 9.11.29, 9.12.0 -\u003e 9.16.13, and versions BIND 9.11.3-S1 -\u003e 9.11.29-S1 and 9.16.8-S1 -\u003e 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.1 of the BIND 9.17 development branch, BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND's default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting values for the tkey-gssapi-keytab or tkey-gssapi-credential configuration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. For servers that meet these conditions, the ISC SPNEGO implementation is vulnerable to various attacks, depending on the CPU architecture for which BIND was built: For named binaries compiled for 64-bit platforms, this flaw can be used to trigger a buffer over-read, leading to a server crash. For named binaries compiled for 32-bit platforms, this flaw can be used to trigger a server crash due to a buffer overflow and possibly also to achieve remote code execution. We have determined that standard SPNEGO implementations are available in the MIT and Heimdal Kerberos libraries, which support a broad range of operating systems, rendering the ISC implementation unnecessary and obsolete. Therefore, to reduce the attack surface for BIND users, we will be removing the ISC SPNEGO implementation in the April releases of BIND 9.11 and 9.16 (it had already been dropped from BIND 9.17). We would not normally remove something from a stable ESV (Extended Support Version) of BIND, but since system libraries can replace the ISC SPNEGO implementation, we have made an exception in this case for reasons of stability and security.","status":"published","published":"2021-04-29T01:15:08.047Z","modified":"2026-06-17T03:41:39.39Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:06:52.81233Z"}],"osv":[{"id":"ALPINE-CVE-2021-25216","description":"In BIND 9.5.0 -\u003e 9.11.29, 9.12.0 -\u003e 9.16.13, and versions BIND 9.11.3-S1 -\u003e 9.11.29-S1 and 9.16.8-S1 -\u003e 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.1 of the BIND 9.17 development branch, BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND's default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting values for the tkey-gssapi-keytab or tkey-gssapi-credential configuration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. For servers that meet these conditions, the ISC SPNEGO implementation is vulnerable to various attacks, depending on the CPU architecture for which BIND was built: For named binaries compiled for 64-bit platforms, this flaw can be used to trigger a buffer over-read, leading to a server crash. For named binaries compiled for 32-bit platforms, this flaw can be used to trigger a server crash due to a buffer overflow and possibly also to achieve remote code execution. We have determined that standard SPNEGO implementations are available in the MIT and Heimdal Kerberos libraries, which support a broad range of operating systems, rendering the ISC implementation unnecessary and obsolete. Therefore, to reduce the attack surface for BIND users, we will be removing the ISC SPNEGO implementation in the April releases of BIND 9.11 and 9.16 (it had already been dropped from BIND 9.17). We would not normally remove something from a stable ESV (Extended Support Version) of BIND, but since system libraries can replace the ISC SPNEGO implementation, we have made an exception in this case for reasons of stability and security.","status":"published","published":"2021-04-29T01:15:08.047Z","modified":"2026-10-23T17:17:56.160698417Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:27:48.646074Z"},{"id":"BELL-CVE-2021-25216","title":"CVE-2021-25216 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:14:20.97341Z","modified":"2026-01-26T09:48:26.835613Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:28:15.925958Z"},{"id":"CVE-2021-25216","description":"In BIND 9.5.0 -\u003e 9.11.29, 9.12.0 -\u003e 9.16.13, and versions BIND 9.11.3-S1 -\u003e 9.11.29-S1 and 9.16.8-S1 -\u003e 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.1 of the BIND 9.17 development branch, BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND's default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting values for the tkey-gssapi-keytab or tkey-gssapi-credential configuration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. For servers that meet these conditions, the ISC SPNEGO implementation is vulnerable to various attacks, depending on the CPU architecture for which BIND was built: For named binaries compiled for 64-bit platforms, this flaw can be used to trigger a buffer over-read, leading to a server crash. For named binaries compiled for 32-bit platforms, this flaw can be used to trigger a server crash due to a buffer overflow and possibly also to achieve remote code execution. We have determined that standard SPNEGO implementations are available in the MIT and Heimdal Kerberos libraries, which support a broad range of operating systems, rendering the ISC implementation unnecessary and obsolete. Therefore, to reduce the attack surface for BIND users, we will be removing the ISC SPNEGO implementation in the April releases of BIND 9.11 and 9.16 (it had already been dropped from BIND 9.17). We would not normally remove something from a stable ESV (Extended Support Version) of BIND, but since system libraries can replace the ISC SPNEGO implementation, we have made an exception in this case for reasons of stability and security.","status":"published","published":"2021-04-29T01:15:08.047Z","modified":"2026-10-24T10:30:52.447006933Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:18.778776Z"},{"id":"DEBIAN-CVE-2021-25216","description":"In BIND 9.5.0 -\u003e 9.11.29, 9.12.0 -\u003e 9.16.13, and versions BIND 9.11.3-S1 -\u003e 9.11.29-S1 and 9.16.8-S1 -\u003e 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.1 of the BIND 9.17 development branch, BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND's default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting values for the tkey-gssapi-keytab or tkey-gssapi-credential configuration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. For servers that meet these conditions, the ISC SPNEGO implementation is vulnerable to various attacks, depending on the CPU architecture for which BIND was built: For named binaries compiled for 64-bit platforms, this flaw can be used to trigger a buffer over-read, leading to a server crash. For named binaries compiled for 32-bit platforms, this flaw can be used to trigger a server crash due to a buffer overflow and possibly also to achieve remote code execution. We have determined that standard SPNEGO implementations are available in the MIT and Heimdal Kerberos libraries, which support a broad range of operating systems, rendering the ISC implementation unnecessary and obsolete. Therefore, to reduce the attack surface for BIND users, we will be removing the ISC SPNEGO implementation in the April releases of BIND 9.11 and 9.16 (it had already been dropped from BIND 9.17). We would not normally remove something from a stable ESV (Extended Support Version) of BIND, but since system libraries can replace the ISC SPNEGO implementation, we have made an exception in this case for reasons of stability and security.","status":"published","published":"2021-04-29T01:15:08.047Z","modified":"2026-10-23T18:02:52.078492037Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:45:34.637046Z"},{"id":"UBUNTU-CVE-2021-25216","description":"In BIND 9.5.0 -\u003e 9.11.29, 9.12.0 -\u003e 9.16.13, and versions BIND 9.11.3-S1 -\u003e 9.11.29-S1 and 9.16.8-S1 -\u003e 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.1 of the BIND 9.17 development branch, BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND's default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting values for the tkey-gssapi-keytab or tkey-gssapi-credential configuration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. For servers that meet these conditions, the ISC SPNEGO implementation is vulnerable to various attacks, depending on the CPU architecture for which BIND was built: For named binaries compiled for 64-bit platforms, this flaw can be used to trigger a buffer over-read, leading to a server crash. For named binaries compiled for 32-bit platforms, this flaw can be used to trigger a server crash due to a buffer overflow and possibly also to achieve remote code execution. We have determined that standard SPNEGO implementations are available in the MIT and Heimdal Kerberos libraries, which support a broad range of operating systems, rendering the ISC implementation unnecessary and obsolete. Therefore, to reduce the attack surface for BIND users, we will be removing the ISC SPNEGO implementation in the April releases of BIND 9.11 and 9.16 (it had already been dropped from BIND 9.17). We would not normally remove something from a stable ESV (Extended Support Version) of BIND, but since system libraries can replace the ISC SPNEGO implementation, we have made an exception in this case for reasons of stability and security.","status":"published","published":"2021-04-28T00:00:00Z","modified":"2026-04-22T12:50:20.233681Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:54:26.779273Z"},{"id":"CLSA-2021-1632261705","title":"Fix of CVE: CVE-2021-25215, CVE-2021-25214, CVE-2021-25216","description":"- A broken inbound incremental zone update (IXFR) can cause named to terminate unexpectedly (CVE-2021-25214)\n- An assertion check can fail while answering queries for DNAME records that require the DNAME to be processed to resolve itself (CVE-2021-25215)\n- A second vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a buffer overflow attack (CVE-2021-25216)","status":"published","published":"2021-09-21T22:01:45Z","modified":"2026-10-21T10:47:11.490296617Z","updated_at":"2026-11-02T15:43:39.801198Z"},{"id":"CLSA-2021-1634922250","title":"Fixed CVEs in bind: CVE-2021-25214, CVE-2021-25216, CVE-2021-25215","description":"- A broken inbound incremental zone update (IXFR) can cause named to terminate unexpectedly (CVE-2021-25214)\n- An assertion check can fail while answering queries for DNAME records that require the DNAME to be processed to resolve itself (CVE-2021-25215)\n- A second vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a buffer overflow attack (CVE-2021-25216)","status":"published","published":"2021-10-22T17:04:10Z","modified":"2026-10-21T10:46:44.708745308Z","updated_at":"2026-11-02T15:43:39.801198Z"},{"id":"DLA-2647-1","title":"bind9 - security update","status":"published","published":"2021-05-04T00:00:00Z","modified":"2026-03-09T01:19:35.036316Z","updated_at":"2026-11-02T15:46:10.712745Z"},{"id":"DSA-4909-1","title":"bind9 - security update","status":"published","published":"2021-05-01T00:00:00Z","modified":"2026-03-09T02:10:04.216417Z","updated_at":"2026-11-02T15:46:17.19998Z"},{"id":"MGASA-2021-0220","title":"Updated bind packages fix security vulnerabilities","description":"A broken inbound incremental zone update (IXFR) can cause named to terminate unexpectedly(CVE-2021-25214). Mageia 7 version not affected.\n\nAn assertion check can fail while answering queries for DNAME records that require the DNAME to be processed to resolve itself (CVE-2021-25215). This affects both versions.\n\nA second vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a buffer overflow attack (CVE-2021-25216). Mageia 7 version not affected.\n","status":"published","published":"2021-05-23T18:45:17Z","modified":"2026-04-16T04:42:20.742549686Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"id":"openSUSE-SU-2024:10650-1","title":"bind-9.16.20-1.4 on GA media","description":"These are all security issues fixed in the bind-9.16.20-1.4 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T02:52:09.525836Z","updated_at":"2026-11-02T16:58:34.487567Z"},{"id":"SUSE-SU-2021:1469-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\n- CVE-2021-25214: Fixed a broken inbound incremental zone update (IXFR) which could have caused named to terminate unexpectedly (bsc#1185345).\n- CVE-2021-25215: Fixed an assertion check which could have failed while answering queries for DNAME records that required the DNAME to be processed to resolve itself (bsc#1185345).\n- CVE-2021-25216: Fixed an issue where policy negotiation can be targeted by a buffer overflow attack (bsc#1185345).\n- MD5 warning message using host, dig, nslookup (bind-utils) with FIPS enabled (bsc#1181495).\n","status":"published","published":"2021-05-04T06:34:07Z","modified":"2026-02-04T04:08:43.638846Z","updated_at":"2026-11-02T15:53:49.138643Z"},{"id":"SUSE-SU-2021:14714-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\n- CVE-2021-25214: Fixed a broken inbound incremental zone update (IXFR) which could have caused named to terminate unexpectedly (bsc#1185345).\n- CVE-2021-25215: Fixed an assertion check which could have failed while answering queries for DNAME records that required the DNAME to be processed to resolve itself (bsc#1185345).\n- CVE-2021-25216: Fixed an issue where policy negotiation can be targeted by a buffer overflow attack (bsc#1185345).\n","status":"published","published":"2021-05-04T06:34:54Z","modified":"2025-05-02T04:31:13.885148Z","updated_at":"2026-11-02T15:53:49.138643Z"},{"id":"USN-4929-1","title":"bind9 vulnerabilities","description":"Greg Kuechle discovered that Bind incorrectly handled certain incremental\nzone updates. A remote attacker could possibly use this issue to cause Bind\nto crash, resulting in a denial of service. (CVE-2021-25214)\n\nSiva Kakarla discovered that Bind incorrectly handled certain DNAME\nrecords. A remote attacker could possibly use this issue to cause Bind to\ncrash, resulting in a denial of service. (CVE-2021-25215)\n\nIt was discovered that Bind incorrectly handled GSSAPI security policy\nnegotiation. A remote attacker could use this issue to cause Bind to crash,\nresulting in a denial of service, or possibly execute arbitrary code.\n(CVE-2021-25216)\n","status":"published","published":"2021-04-29T11:11:53Z","modified":"2026-04-22T10:13:57.319279Z","updated_at":"2026-11-02T16:58:15.159055Z"},{"id":"USN-7739-1","title":"bind9 vulnerabilities","description":"Greg Kuechle discovered that Bind incorrectly handled certain incremental\nzone updates. A remote attacker could possibly use this issue to cause Bind\nto crash, resulting in a denial of service. (CVE-2021-25214)\n\nSiva Kakarla discovered that Bind incorrectly handled certain DNAME\nrecords. A remote attacker could possibly use this issue to cause Bind to\ncrash, resulting in a denial of service. (CVE-2021-25215)\n\nIt was discovered that Bind incorrectly handled GSSAPI security policy\nnegotiation. A remote attacker could use this issue to cause Bind to crash,\nresulting in a denial of service, or possibly execute arbitrary code.\n(CVE-2021-25216)","status":"published","published":"2025-09-08T00:14:04Z","modified":"2026-04-22T11:01:19.916857Z","updated_at":"2026-11-02T16:58:21.91885Z"}]}}