{"id":"CVE-2021-25219","aliases":["ALPINE-CVE-2021-25219","ALSA-2022:2092","AZL-6327","BELL-CVE-2021-25219","CLSA-2021-1635957830","CLSA-2021-1637070791","CLSA-2021-1639681836","CLSA-2022-1654175851","CLSA-2022-1654511849","DEBIAN-CVE-2021-25219","DLA-2807-1","DSA-4994-1","EUVD-2021-12130","GHSA-x6vq-rxvf-3ggc","MGASA-2021-0560","OESA-2021-1459","OESA-2022-1993","RHSA-2022:2092","RLSA-2022:2092","SUSE-SU-2021:3657-1","SUSE-SU-2021:3773-1","SUSE-SU-2022:0151-1","SUSE-SU-2022:2713-1","UBUNTU-CVE-2021-25219","USN-5126-1","USN-5126-2","openSUSE-SU-2021:1502-1","openSUSE-SU-2021:3773-1","openSUSE-SU-2022:0151-1","openSUSE-SU-2024:11660-1"],"status":"published","title":"Lame cache can be abused to severely degrade resolver performance","description":"In BIND 9.3.0 -\u003e 9.11.35, 9.12.0 -\u003e 9.16.21, and versions 9.9.3-S1 -\u003e 9.11.35-S1 and 9.16.8-S1 -\u003e 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-07","score":0.11158,"percentile":0.95973,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2021-10-27T00:00:00Z","modified":"2026-10-29T11:01:04Z","fixes":[{"ecosystem":"Alpine:v3.12","package":"bind","fixed_in":["9.16.27-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"bind","fixed_in":["9.16.25-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"bind","fixed_in":["9.16.25-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"bind","fixed_in":["9.16.22-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"bind","fixed_in":["9.16.22-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"bind","fixed_in":["9.16.22-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"bind","fixed_in":["9.16.22-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"bind","fixed_in":["9.16.22-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"bind","fixed_in":["9.16.22-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"bind","fixed_in":["9.16.22-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"bind","fixed_in":["9.16.22-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"bind","fixed_in":["9.16.22-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"bind","fixed_in":["9.16.22-r0"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"bind","fixed_in":["32:9.11.36-3.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"bind-chroot","fixed_in":["32:9.11.36-3.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"bind-devel","fixed_in":["32:9.11.36-3.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"bind-export-devel","fixed_in":["32:9.11.36-3.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"bind-export-libs","fixed_in":["32:9.11.36-3.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"bind-libs","fixed_in":["32:9.11.36-3.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"bind-libs-lite","fixed_in":["32:9.11.36-3.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"bind-license","fixed_in":["32:9.11.36-3.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"bind-lite-devel","fixed_in":["32:9.11.36-3.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"bind-pkcs11","fixed_in":["32:9.11.36-3.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"bind-pkcs11-devel","fixed_in":["32:9.11.36-3.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"bind-pkcs11-libs","fixed_in":["32:9.11.36-3.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"bind-pkcs11-utils","fixed_in":["32:9.11.36-3.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"bind-sdb","fixed_in":["32:9.11.36-3.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"bind-sdb-chroot","fixed_in":["32:9.11.36-3.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"bind-utils","fixed_in":["32:9.11.36-3.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"python3-bind","fixed_in":["32:9.11.36-3.el8"],"sources":["osv"]},{"ecosystem":"Azure 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Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25219","tags":["web","advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EF4NAVRV4H3W4GA3LGGZYUKD3HSJBAVW/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YGV7SA27CTYLGFJSPUM3V36ZWK7WWDI4/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YTKC4E3HUOLYN5IA4EBL4VAQSWG2ZVTX/"},{"url":"https://github.com/advisories/GHSA-x6vq-rxvf-3ggc"},{"url":"https://security.alpinelinux.org/vuln/CVE-2021-25219","tags":["advisory"]},{"url":"https://errata.almalinux.org/8/ALSA-2022-2092.html","tags":["advisory"]},{"url":"https://vulners.com/cve/CVE-2021-25219","tags":["report"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2021-25219","tags":["advisory"]},{"url":"https://errata.cloudlinux.com/ol6/CLSA-2021-1635957830.html","tags":["advisory"]},{"url":"https://errata.cloudlinux.com/els6/CLSA-2021-1637070791.html","tags":["advisory"]},{"url":"https://errata.cloudlinux.com/ubuntu16_04/CLSA-2021-1639681836","tags":["advisory"]},{"url":"https://errata.cloudlinux.com/centos8.5-els/CLSA-2022-1654175851.html","tags":["advisory"]},{"url":"https://errata.cloudlinux.com/centos8.4-els/CLSA-2022-1654511849.html","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-25219","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2021-0560.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=29427","tags":["report"]},{"url":"https://kb.isc.org/docs/cve-2021-25219","tags":["web","report"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1459","tags":["advisory"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1993","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25215","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25214","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25220","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2022:2092","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#moderate","tags":["article"]},{"url":"https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.6_release_notes/","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1934035","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1950714","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2013993","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2017636","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2021814","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2030239","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2022/rhsa-2022_2092.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-25219","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-25219","tags":["advisory","report"]},{"url":"https://errata.rockylinux.org/RLSA-2022:2092","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2021/suse-su-20213657-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1192146","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2021-25219","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2021/suse-su-20213773-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2022/suse-su-20220151-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2022/suse-su-20222713-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1197135","tags":["report"]},{"url":"https://bugzilla.suse.com/1197136","tags":["report"]},{"url":"https://bugzilla.suse.com/1199044","tags":["report"]},{"url":"https://bugzilla.suse.com/1200685","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2021-25220","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2022-0396","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2021-25219","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-5126-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-5126-2","tags":["advisory"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/BH5L6EVZD44DQGVSOTGIGWP2H7IUPK2N/","tags":["advisory"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/J67T6X7DSN2PDCNE3ENLU6MB6USV53JZ/","tags":["advisory"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/LJ7DM7F3IHCRMEZDBDGMA5O6A5EWNQKE/","tags":["advisory"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2021-25219","title":"Lame cache can be abused to severely degrade resolver performance","description":"In BIND 9.3.0 -\u003e 9.11.35, 9.12.0 -\u003e 9.16.21, and versions 9.9.3-S1 -\u003e 9.11.35-S1 and 9.16.8-S1 -\u003e 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.","status":"published","published":"2021-10-27T21:10:10.088Z","modified":"2024-09-16T17:33:38.865Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:32:59.430294Z"}],"euvd":[{"id":"EUVD-2021-12130","description":"In BIND 9.3.0 -\u003e 9.11.35, 9.12.0 -\u003e 9.16.21, and versions 9.9.3-S1 -\u003e 9.11.35-S1 and 9.16.8-S1 -\u003e 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.","status":"published","published":"2021-10-27T21:10:10Z","modified":"2024-09-16T17:33:38Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-03T00:55:41.00036Z"}],"ghsa":[{"id":"GHSA-x6vq-rxvf-3ggc","title":"In BIND 9.3.0 -\u003e 9.11.35, 9.12.0 -\u003e 9.16.21, and versions 9.9.3-S1 -\u003e 9.11.35-S1 and 9.16.8-S1 -\u003e...","description":"In BIND 9.3.0 -\u003e 9.11.35, 9.12.0 -\u003e 9.16.21, and versions 9.9.3-S1 -\u003e 9.11.35-S1 and 9.16.8-S1 -\u003e 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.","status":"published","published":"2022-05-24T19:18:53Z","modified":"2023-01-30T05:02:42Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T14:46:42.161058Z"}],"nvd":[{"id":"CVE-2021-25219","description":"In BIND 9.3.0 -\u003e 9.11.35, 9.12.0 -\u003e 9.16.21, and versions 9.9.3-S1 -\u003e 9.11.35-S1 and 9.16.8-S1 -\u003e 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.","status":"published","published":"2021-10-27T21:15:07.613Z","modified":"2026-06-17T03:41:40.02Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:07:00.549994Z"}],"osv":[{"id":"ALPINE-CVE-2021-25219","description":"In BIND 9.3.0 -\u003e 9.11.35, 9.12.0 -\u003e 9.16.21, and versions 9.9.3-S1 -\u003e 9.11.35-S1 and 9.16.8-S1 -\u003e 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.","status":"published","published":"2021-10-27T21:15:07.613Z","modified":"2026-10-23T17:17:56.161374517Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:27:48.646074Z"},{"id":"AZL-6327","title":"CVE-2021-25219 affecting package bind for versions less than 9.16.29-1","description":"In BIND 9.3.0 -\u003e 9.11.35, 9.12.0 -\u003e 9.16.21, and versions 9.9.3-S1 -\u003e 9.11.35-S1 and 9.16.8-S1 -\u003e 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.","status":"published","published":"2021-10-27T21:15:07Z","modified":"2026-04-21T04:32:09.178303Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:28:07.805289Z"},{"id":"BELL-CVE-2021-25219","title":"CVE-2021-25219 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:15:09.188767Z","modified":"2026-01-26T09:46:17.017728Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:28:15.925958Z"},{"id":"CVE-2021-25219","description":"In BIND 9.3.0 -\u003e 9.11.35, 9.12.0 -\u003e 9.16.21, and versions 9.9.3-S1 -\u003e 9.11.35-S1 and 9.16.8-S1 -\u003e 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.","status":"published","published":"2021-10-27T21:15:07.613Z","modified":"2026-10-24T10:30:27.45606824Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:44:18.778776Z"},{"id":"DEBIAN-CVE-2021-25219","description":"In BIND 9.3.0 -\u003e 9.11.35, 9.12.0 -\u003e 9.16.21, and versions 9.9.3-S1 -\u003e 9.11.35-S1 and 9.16.8-S1 -\u003e 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.","status":"published","published":"2021-10-27T21:15:07.613Z","modified":"2026-10-23T18:02:57.585816923Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:45:34.637046Z"},{"id":"OESA-2021-1459","title":"bind security update","description":"Domain Name System (DNS) Server.\r\n\r\nSecurity Fix(es):\r\n\r\nIn BIND 9.3.0 -\u0026gt; 9.11.35, 9.12.0 -\u0026gt; 9.16.21, and versions 9.9.3-S1 -\u0026gt; 9.11.35-S1 and 9.16.8-S1 -\u0026gt; 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u0026gt; 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.(CVE-2021-25219)","status":"published","published":"2021-12-10T11:04:44Z","modified":"2026-08-18T01:16:15.330058391Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:52:38.987987Z"},{"id":"OESA-2022-1993","title":"dhcp security update","description":"The Dynamic Host Configuration Protocol (DHCP) is a network management protocol used on UDP/IP networks whereby a DHCP server dynamically assigns an IP address and other network configuration parameters to each device on a network so they can communicate with other IP networks.\r\n\r\nSecurity Fix(es):\r\n\r\nIn BIND 9.0.0 -\u0026gt; 9.11.29, 9.12.0 -\u0026gt; 9.16.13, and versions BIND 9.9.3-S1 -\u0026gt; 9.11.29-S1 and 9.16.8-S1 -\u0026gt; 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u0026gt; 9.17.11 of the BIND 9.17 development branch, when a vulnerable version of named receives a query for a record triggering the flaw described above, the named process will terminate due to a failed assertion check. The vulnerability affects all currently maintained BIND 9 branches (9.11, 9.11-S, 9.16, 9.16-S, 9.17) as well as all other versions of BIND 9.(CVE-2021-25215)\r\n\r\nIn BIND 9.8.5 -\u0026gt; 9.8.8, 9.9.3 -\u0026gt; 9.11.29, 9.12.0 -\u0026gt; 9.16.13, and versions BIND 9.9.3-S1 -\u0026gt; 9.11.29-S1 and 9.16.8-S1 -\u0026gt; 9.16.13-S1 of BIND 9 Supported Preview Edition, as well as release versions 9.17.0 -\u0026gt; 9.17.11 of the BIND 9.17 development branch, when a vulnerable version of named receives a malformed IXFR triggering the flaw described above, the named process will terminate due to a failed assertion the next time the transferred secondary zone is refreshed.(CVE-2021-25214)\r\n\r\nIn BIND 9.3.0 -\u0026gt; 9.11.35, 9.12.0 -\u0026gt; 9.16.21, and versions 9.9.3-S1 -\u0026gt; 9.11.35-S1 and 9.16.8-S1 -\u0026gt; 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u0026gt; 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.(CVE-2021-25219)\r\n\r\nBIND 9.11.0 -\u0026gt; 9.11.36 9.12.0 -\u0026gt; 9.16.26 9.17.0 -\u0026gt; 9.18.0 BIND Supported Preview Editions: 9.11.4-S1 -\u0026gt; 9.11.36-S1 9.16.8-S1 -\u0026gt; 9.16.26-S1 Versions of BIND 9 earlier than those shown - back to 9.1.0, including Supported Preview Editions - are also believed to be affected but have not been tested as they are EOL. The cache could become poisoned with incorrect records leading to queries being made to the wrong servers, which might also result in false information being returned to clients.(CVE-2021-25220)","status":"published","published":"2022-10-14T11:05:18Z","modified":"2026-08-18T01:17:19.985399862Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:39.528805Z"},{"id":"RHSA-2022:2092","title":"Red Hat Security Advisory: bind security, bug fix, and enhancement update","status":"published","published":"2024-09-16T07:08:46Z","modified":"2026-06-26T12:22:10.250675521Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:53:09.62945Z"},{"id":"RLSA-2022:2092","title":"Moderate: bind security, bug fix, and enhancement update","description":"The Berkeley Internet Name Domain (BIND) is an implementation of the Domain Name System (DNS) protocols. BIND includes a DNS server (named); a resolver library (routines for applications to use when interfacing with DNS); and tools for verifying that the DNS server is operating correctly.\n\nThe following packages have been upgraded to a later upstream version: bind (9.11.36). (BZ#2013993)\n\nSecurity Fix(es):\n\n* bind: Lame cache can be abused to severely degrade resolver performance (CVE-2021-25219)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Rocky Linux 8.6 Release Notes linked from the References section.","status":"published","published":"2022-05-10T06:53:47Z","modified":"2026-02-05T04:00:09.477748Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:53:24.322216Z"},{"id":"UBUNTU-CVE-2021-25219","description":"In BIND 9.3.0 -\u003e 9.11.35, 9.12.0 -\u003e 9.16.21, and versions 9.9.3-S1 -\u003e 9.11.35-S1 and 9.16.8-S1 -\u003e 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.","status":"published","published":"2021-10-27T00:00:00Z","modified":"2026-04-22T12:50:08.86113Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:54:26.779273Z"},{"id":"ALSA-2022:2092","title":"Moderate: bind security, bug fix, and enhancement update","description":"The Berkeley Internet Name Domain (BIND) is an implementation of the Domain Name System (DNS) protocols. BIND includes a DNS server (named); a resolver library (routines for applications to use when interfacing with DNS); and tools for verifying that the DNS server is operating correctly.\n\nThe following packages have been upgraded to a later upstream version: bind (9.11.36). (BZ#2013993)\n\nSecurity Fix(es):\n\n* bind: Lame cache can be abused to severely degrade resolver performance (CVE-2021-25219)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.","status":"published","published":"2022-05-10T06:53:47Z","modified":"2026-10-29T11:01:04.043853461Z","updated_at":"2026-11-02T15:27:51.196609Z"},{"id":"CLSA-2021-1635957830","title":"Fixed CVE-2021-25219 in bind","description":"- CVE-2021-25219: Fix resolver performance degradation via lame cache abuse","status":"published","published":"2021-11-03T16:43:50Z","modified":"2026-06-01T00:33:24.176005685Z","updated_at":"2026-11-02T15:43:39.801198Z"},{"id":"CLSA-2021-1637070791","title":"Fix of CVE: CVE-2021-25219","description":"- CVE-2021-25219: Fix resolver performance degradation via lame cache abuse","status":"published","published":"2021-11-16T13:53:11Z","modified":"2026-06-01T00:32:14.04373358Z","updated_at":"2026-11-02T15:43:39.801198Z"},{"id":"CLSA-2021-1639681836","title":"Fix CVE(s): CVE-2021-25219","description":"\n   * SECURITY UPDATE: resolver performance degradation via lame cache abuse\n     - debian/patches/CVE-2021-25219.patch: disable lame cache in\n       bin/named/config.c, bin/named/server.c, lib/dns/resolver.c.\n     - CVE-2021-25219","status":"published","published":"2021-12-16T19:10:36Z","modified":"2026-06-04T10:04:14.456906Z","updated_at":"2026-11-02T15:43:39.801198Z"},{"id":"CLSA-2022-1654175851","title":"Fixed CVE-2021-25219 in bind","description":"- CVE-2021-25219: fix possible performance degradation by disabling lame-ttl cache","status":"published","published":"2022-06-02T13:17:31Z","modified":"2026-06-01T00:32:32.767730098Z","updated_at":"2026-11-02T15:43:40.176048Z"},{"id":"CLSA-2022-1654511849","title":"Fixed CVE-2021-25219 in bind","description":"- CVE-2021-25219: fix possible performance degradation by disabling lame-ttl cache","status":"published","published":"2022-06-06T10:37:29Z","modified":"2026-06-01T00:33:10.906572506Z","updated_at":"2026-11-02T15:43:40.176048Z"},{"id":"DLA-2807-1","title":"bind9 - security update","status":"published","published":"2021-11-01T00:00:00Z","modified":"2026-03-09T01:23:35.993494Z","updated_at":"2026-11-02T15:46:11.189256Z"},{"id":"DSA-4994-1","title":"bind9 - security update","status":"published","published":"2021-10-28T00:00:00Z","modified":"2026-03-09T02:09:31.291188Z","updated_at":"2026-11-02T15:46:17.543497Z"},{"id":"MGASA-2021-0560","title":"Updated bind packages fix security vulnerability","description":"Updated bind packages fix security vulnerability:\n\nKishore Kumar Kothapalli discovered that the lame server cache in BIND,\na DNS server implementation, can be abused by an attacker to significantly\ndegrade resolver performance, resulting in denial of service (large delays\nfor responses for client queries and DNS timeouts on client hosts)\n(CVE-2021-25219).\n","status":"published","published":"2021-12-19T12:26:08Z","modified":"2026-04-16T04:43:18.943925456Z","updated_at":"2026-11-02T15:49:41.849028Z"},{"id":"openSUSE-SU-2021:1502-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\n- CVE-2021-25219: Fixed lame cache that could have been abused to severely degrade resolver performance (bsc#1192146).\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2021-11-24T16:00:12Z","modified":"2026-02-04T04:24:35.598962Z","updated_at":"2026-11-02T16:58:32.266854Z"},{"id":"openSUSE-SU-2021:3773-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\n- CVE-2021-25219: Fixed lame cache that could have been abused to severely degrade resolver performance (bsc#1192146).\n","status":"published","published":"2021-11-23T14:49:46Z","modified":"2026-02-04T02:15:21.958395Z","updated_at":"2026-11-02T16:58:32.266854Z"},{"id":"openSUSE-SU-2022:0151-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\n- CVE-2021-25219: Fixed flaw that allowed abusing lame cache to severely degrade resolver performance (bsc#1192146).\n","status":"published","published":"2022-01-21T11:41:01Z","modified":"2026-02-04T02:22:32.359603Z","updated_at":"2026-11-02T16:58:32.653274Z"},{"id":"openSUSE-SU-2024:11660-1","title":"bind-9.16.20-3.1 on GA media","description":"These are all security issues fixed in the bind-9.16.20-3.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T04:21:12.938463Z","updated_at":"2026-11-02T16:58:35.195147Z"},{"id":"SUSE-SU-2021:3657-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\n- CVE-2021-25219: Fixed lame cache that could have been abused to severely degrade resolver performance (bsc#1192146).\n","status":"published","published":"2021-11-11T10:38:15Z","modified":"2026-02-04T04:28:58.651432Z","updated_at":"2026-11-02T15:53:49.605187Z"},{"id":"SUSE-SU-2021:3773-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\n- CVE-2021-25219: Fixed lame cache that could have been abused to severely degrade resolver performance (bsc#1192146).\n","status":"published","published":"2021-11-23T14:49:45Z","modified":"2026-02-04T02:40:55.47001Z","updated_at":"2026-11-02T15:53:49.605187Z"},{"id":"SUSE-SU-2022:0151-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\n- CVE-2021-25219: Fixed flaw that allowed abusing lame cache to severely degrade resolver performance (bsc#1192146).\n","status":"published","published":"2022-01-21T11:41:00Z","modified":"2026-02-04T03:33:47.583393Z","updated_at":"2026-11-02T15:53:50.066806Z"},{"id":"SUSE-SU-2022:2713-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\n- CVE-2021-25219: Fixed flaw that allowed abusing lame cache to severely degrade resolver performance (bsc#1192146).\n- CVE-2021-25220: Fixed potentially incorrect answers by cached forwarders (bsc#1197135).\n- CVE-2022-0396: Fixed a incorrect handling of TCP connection slots time frame  leading to deny of service (bsc#1197136).\n\nThe following non-security bugs were fixed:\n\n- Update to release 9.16.31 (jsc#SLE-24600). \n- Logrotation broken since dropping chroot (bsc#1200685).\n- A non-existent initialization script (eg a leftorver\n  'createNamedConfInclude' in /etc/sysconfig/named) may cause named\n  not to start. A warning message is printed in named.prep and\n  the fact is ignored.\n  Also, the return value of a failed script was not handled properly\n  causing a failed script to not prevent named to start. This\n  is now fixed properly.\n  [bsc#1199044, vendor-files.tar.bz2]\n","status":"published","published":"2022-08-09T10:38:14Z","modified":"2026-02-04T04:18:09.23641Z","updated_at":"2026-11-02T15:53:50.965375Z"},{"id":"USN-5126-1","title":"bind9 vulnerability","description":"Kishore Kumar Kothapalli discovered that Bind incorrectly handled the lame\ncache when processing responses. A remote attacker could possibly use this\nissue to cause Bind to consume resources, resulting in a denial of service.\n","status":"published","published":"2021-10-28T10:52:18Z","modified":"2026-04-22T10:18:31.59434Z","updated_at":"2026-11-02T16:58:15.683829Z"},{"id":"USN-5126-2","title":"bind9 vulnerability","description":"USN-5126-1 fixed a vulnerability in Bind. This update provides\nthe corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.\n\nOriginal advisory details:\n\n Kishore Kumar Kothapalli discovered that Bind incorrectly handled the lame\n cache when processing responses. A remote attacker could possibly use this\n issue to cause Bind to consume resources, resulting in a denial of service.\n","status":"published","published":"2021-10-28T18:25:41Z","modified":"2026-06-29T13:49:34.589927796Z","updated_at":"2026-11-02T16:58:15.683829Z"}]}}