{"id":"CVE-2018-20217","aliases":["ALPINE-CVE-2018-20217","BELL-CVE-2018-20217","CLSA-2023-1675372649","DEBIAN-CVE-2018-20217","DLA-1643-1","DLA-2771-1","EUVD-2018-12784","GHSA-f4hc-rvh5-8phv","MGASA-2019-0028","RHBA-2019:2599","SUSE-SU-2019:0111-1","SUSE-SU-2019:0113-1","SUSE-SU-2019:0113-2","UBUNTU-CVE-2018-20217","USN-5828-1","openSUSE-SU-2019:0063-1","openSUSE-SU-2024:11549-1"],"status":"published","title":"A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17....","description":"A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01417,"percentile":0.72972,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-617"],"published":"2018-12-26T20:00:00Z","modified":"2026-10-23T18:03:21Z","fixes":[{"ecosystem":"Alpine:v3.10","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.11","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.12","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.6","package":"krb5","fixed_in":["1.14.3-r3"],"sources":["osv"]},{"ecosystem":"Alpine:v3.7","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.8","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.9","package":"krb5","fixed_in":["1.15.4-r0"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"krb5-admin-server","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"krb5-doc","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"krb5-gss-samples","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"krb5-k5tls","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"krb5-kdc","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"krb5-kdc-ldap","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"krb5-locales","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"krb5-multidev","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"krb5-otp","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"krb5-pkinit","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"krb5-user","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"libgssapi-krb5-2","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"libgssrpc4","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"libk5crypto3","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"libkadm5clnt-mit9","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"libkadm5srv-mit9","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"libkdb5-8","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"libkrad-dev","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"libkrad0","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"libkrb5-3","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"libkrb5-dev","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:Ubuntu:16.04","package":"libkrb5support0","fixed_in":["1.13.2+dfsg-5ubuntu2.2+tuxcare.els2"],"sources":["osv"]},{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Advisory","fix"]},{"url":"https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://lists.debian.org/debian-lts-announce/2019/01/msg00020.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20190416-0006/","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-20217","tags":["advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/","tags":["report"]},{"url":"https://github.com/advisories/GHSA-f4hc-rvh5-8phv"},{"url":"https://security.alpinelinux.org/vuln/CVE-2018-20217","tags":["advisory"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2018-20217","tags":["advisory"]},{"url":"https://errata.cloudlinux.com/ubuntu16-els/CLSA-2023-1675372649","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2018-20217","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2019-0028.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=24068","tags":["report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/","tags":["web"]},{"url":"https://access.redhat.com/errata/RHBA-2019:2599","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2019/rhba-2019_2599.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2018-20217","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1665296","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-20217","tags":["advisory","report"]},{"url":"https://www.suse.com/support/update/announcement/2019/suse-su-20190111-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1120489","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2018-20217","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2019/suse-su-20190113-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2019/suse-su-20190113-2/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2018-20217","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-5828-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2022-42898","tags":["report"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/LPHHD47HJF3GUJVEDHEG7BT7M2YJ4GPH/#LPHHD47HJF3GUJVEDHEG7BT7M2YJ4GPH","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28196","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2018-20217","description":"A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request.","status":"published","published":"2018-12-26T20:00:00Z","modified":"2024-08-05T11:58:19.09Z","updated_at":"2026-11-02T14:34:59.872731Z"}],"euvd":[{"id":"EUVD-2018-12784","description":"A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request.","status":"published","published":"2018-12-26T20:00:00Z","modified":"2024-08-05T11:58:19Z","updated_at":"2026-11-03T02:39:30.889297Z"}],"ghsa":[{"id":"GHSA-f4hc-rvh5-8phv","title":"A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17....","description":"A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request.","status":"published","published":"2022-05-13T01:05:39Z","modified":"2023-02-01T05:02:53Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-617"],"updated_at":"2026-11-02T14:49:58.981291Z"}],"nvd":[{"id":"CVE-2018-20217","description":"A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request.","status":"published","published":"2018-12-26T21:29:02.543Z","modified":"2026-06-17T01:52:28.013Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":3.5,"vector":"AV:N/AC:M/Au:S/C:N/I:N/A:P","level":"low","assessor":"primary"}],"cwes":["CWE-617"],"updated_at":"2026-11-02T14:04:52.056758Z"}],"osv":[{"id":"ALPINE-CVE-2018-20217","description":"A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request.","status":"published","published":"2018-12-26T21:29:02.543Z","modified":"2026-10-23T17:17:55.24556835Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:27:47.187336Z"},{"id":"BELL-CVE-2018-20217","title":"CVE-2018-20217 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:14:29.835264Z","modified":"2026-01-26T09:46:41.656439Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:28:14.701973Z"},{"id":"CVE-2018-20217","description":"A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request.","status":"published","published":"2018-12-26T21:29:02.543Z","modified":"2026-10-20T13:19:32.659282823Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:09.145458Z"},{"id":"DEBIAN-CVE-2018-20217","description":"A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request.","status":"published","published":"2018-12-26T21:29:02.543Z","modified":"2026-10-23T18:03:21.031530431Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:30.57382Z"},{"id":"RHBA-2019:2599","title":"Red Hat Bug Fix Advisory: krb5 bug fix update","status":"published","published":"2024-09-16T02:44:59Z","modified":"2026-06-29T10:23:21Z","cvss":[{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:52:58.117212Z"},{"id":"UBUNTU-CVE-2018-20217","description":"A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request.","status":"published","published":"2018-12-26T21:29:00Z","modified":"2026-04-22T11:51:21.211626Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"},{"version":"3.0","score":5.3,"vector":"CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:17.91743Z"},{"id":"CLSA-2023-1675372649","title":"Fix CVE(s): CVE-2018-20217","description":"\n   * SECURITY UPDATE: Possible KDC crash processing malformed S4U2Self request\n     - debian/patches/CVE-2018-20217.patch: ignore password attributes for\n       S4U2Self requests\n     - CVE-2018-20217","status":"published","published":"2023-02-02T21:17:29Z","modified":"2026-06-04T10:04:11.485861Z","updated_at":"2026-11-02T15:43:40.176048Z"},{"id":"DLA-1643-1","title":"krb5 - security update","status":"published","published":"2019-01-25T00:00:00Z","modified":"2026-03-09T01:22:04.727225Z","updated_at":"2026-11-02T15:46:09.777694Z"},{"id":"DLA-2771-1","title":"krb5 - security update","status":"published","published":"2021-09-30T00:00:00Z","modified":"2026-03-09T01:20:11.686302Z","updated_at":"2026-11-02T15:46:11.189256Z"},{"id":"MGASA-2019-0028","title":"Updated krb5 packages fix security vulnerability","description":"An authenticated user who can obtain a TGT using an older encryption\ntype (DES, DES3, or RC4) can cause an assertion failure in the KDC by\nsending an S4U2Self request (CVE-2018-20217).\n","status":"published","published":"2019-01-10T10:53:49Z","modified":"2026-04-16T06:23:57.296790965Z","updated_at":"2026-11-02T15:49:40.793816Z"},{"id":"openSUSE-SU-2019:0063-1","title":"Security update for krb5","description":"This update for krb5 fixes the following issues:\n\nSecurity issue fixed:\n\n- CVE-2018-20217: Fixed an assertion issue with older encryption types (bsc#1120489)\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2019-03-23T10:47:35Z","modified":"2026-02-04T02:15:30.729235Z","updated_at":"2026-11-02T16:58:30.39372Z"},{"id":"openSUSE-SU-2024:11549-1","title":"krb5-1.19.2-3.1 on GA media","description":"These are all security issues fixed in the krb5-1.19.2-3.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T04:19:01.194111Z","updated_at":"2026-11-02T16:58:35.195147Z"},{"id":"SUSE-SU-2019:0111-1","title":"Security update for krb5","description":"This update for krb5 fixes the following issues:\n\nSecurity issue fixed:\n\n- CVE-2018-20217: Fixed an assertion issue with older encryption types (bsc#1120489)\n","status":"published","published":"2019-01-17T13:19:09Z","modified":"2026-02-04T03:46:11.688718Z","updated_at":"2026-11-02T15:53:45.926331Z"},{"id":"SUSE-SU-2019:0113-1","title":"Security update for krb5","description":"This update for krb5 fixes the following issues:\n\nSecurity issue fixed:\n\n- CVE-2018-20217: Fixed an assertion issue with older encryption types (bsc#1120489)\n","status":"published","published":"2019-01-17T13:19:56Z","modified":"2026-02-04T03:49:12.709212Z","updated_at":"2026-11-02T15:53:45.926331Z"},{"id":"SUSE-SU-2019:0113-2","title":"Security update for krb5","description":"This update for krb5 fixes the following issues:\n\nSecurity issue fixed:\n\n- CVE-2018-20217: Fixed an assertion issue with older encryption types (bsc#1120489)\n","status":"published","published":"2019-04-16T11:50:46Z","modified":"2026-02-04T03:28:20.410979Z","updated_at":"2026-11-02T15:53:45.926331Z"},{"id":"USN-5828-1","title":"krb5 vulnerabilities","description":"It was discovered that Kerberos incorrectly handled certain S4U2Self\nrequests. An attacker could possibly use this issue to cause a denial of\nservice. This issue was only addressed in Ubuntu 16.04 ESM and Ubuntu\n18.04 LTS. (CVE-2018-20217)\n\nGreg Hudson discovered that Kerberos PAC implementation incorrectly\nhandled certain parsing operations. A remote attacker could use this\nissue to cause a denial of service, or possibly execute arbitrary code.\n(CVE-2022-42898)\n","status":"published","published":"2023-01-25T20:14:24Z","modified":"2026-06-29T13:50:46.376178459Z","updated_at":"2026-11-02T16:58:16.738762Z"}]}}