{"id":"CVE-2020-28196","title":"MIT Kerberos 5 (aka krb5) before 1.17.2 and 1.18.x before 1.18.3 allows unbounded recursion via an ASN.1-encoded Kerberos message because the lib/krb5/asn.1/asn1_encode.c support for BER indefinite lengths lacks a recursion limit.","summary":"MIT Kerberos 5 (aka krb5) before 1.17.2 and 1.18.x before 1.18.3 allows unbounded recursion via an ASN.1-encoded Kerberos message because the lib/krb5/asn.1/asn1_encode.c support for BER indefinite lengths lacks a recursion limit.","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-674","CWE-674"],"vendor":"mit","product":"kerberos_5","affected":["kerberos_5 < 1.17.2","kerberos_5 >= 1.18.0, < 1.18.3","fedora = 31","active_iq_unified_manager","cloud_backup","oncommand_insight","oncommand_workflow_automation","snapcenter","communications_cloud_native_core_policy = 1.14.0","communications_offline_mediation_controller = 12.0.0.3.0","communications_pricing_design_center = 12.0.0.3.0","mysql_server <= 8.0.23"],"patched":["kerberos_5 1.18.3"],"published":"2020-11-06","updated":"2026-10-14","sourceUpdated":"2026-10-14T10:17:34.147","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2020-28196","references":[{"url":"https://github.com/krb5/krb5/commit/57415dda6cf04e73ffc3723be518eddfae599bfd","label":"cve@mitre.org"},{"url":"https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E","label":"cve@mitre.org"},{"url":"https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E","label":"cve@mitre.org"},{"url":"https://lists.debian.org/debian-lts-announce/2020/11/msg00011.html","label":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/45KKOZQWIIIW5C45PJVGQ32AXBSYNBE7/","label":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/73IGOG6CZAVMVNS4GGRMOLOZ7B6QVA7F/","label":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KPH2V3WSQTELROZK3GFCPQDOFLKIZ6H5/","label":"cve@mitre.org"},{"url":"https://security.gentoo.org/glsa/202011-17","label":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20201202-0001/","label":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20210513-0002/","label":"cve@mitre.org"},{"url":"https://www.debian.org/security/2020/dsa-4795","label":"cve@mitre.org"},{"url":"https://www.oracle.com//security-alerts/cpujul2021.html","label":"cve@mitre.org"},{"url":"https://www.oracle.com/security-alerts/cpuApr2021.html","label":"cve@mitre.org"},{"url":"https://www.oracle.com/security-alerts/cpuapr2022.html","label":"cve@mitre.org"},{"url":"https://github.com/krb5/krb5/commit/57415dda6cf04e73ffc3723be518eddfae599bfd","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2020/11/msg00011.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/45KKOZQWIIIW5C45PJVGQ32AXBSYNBE7/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/73IGOG6CZAVMVNS4GGRMOLOZ7B6QVA7F/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KPH2V3WSQTELROZK3GFCPQDOFLKIZ6H5/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202011-17","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20201202-0001/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20210513-0002/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2020/dsa-4795","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com//security-alerts/cpujul2021.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpuApr2021.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpuapr2022.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.04417,"epssPercentile":0.91147,"ingestedAt":"2026-10-14T10:25:41.180Z","slug":"CVE-2020-28196","body":"## Overview\n\nMIT Kerberos 5 (aka krb5) before 1.17.2 and 1.18.x before 1.18.3 allows unbounded recursion via an ASN.1-encoded Kerberos message because the lib/krb5/asn.1/asn1_encode.c support for BER indefinite lengths lacks a recursion limit.\n\n## Affected\n\n- `kerberos_5 < 1.17.2`\n- `kerberos_5 >= 1.18.0, < 1.18.3`\n- `fedora = 31`\n- `active_iq_unified_manager`\n- `cloud_backup`\n- `oncommand_insight`\n- `oncommand_workflow_automation`\n- `snapcenter`\n- `communications_cloud_native_core_policy = 1.14.0`\n- `communications_offline_mediation_controller = 12.0.0.3.0`\n- `communications_pricing_design_center = 12.0.0.3.0`\n- `mysql_server <= 8.0.23`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `kerberos_5 1.18.3`","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.3,"likelihood":0.9,"exploitation":0,"ransomware":0},"changes":[]}