{"id":"CVE-2021-37750","title":"The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.","summary":"The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-476"],"vendor":"mit","product":"kerberos_5","affected":["kerberos_5 < 1.18.5","kerberos_5 >= 1.19.0, < 1.19.3","fedora = 33","debian_linux = 9.0","starwind_virtual_san = v8r13","communications_cloud_native_core_network_slice_selection_function = 22.1.0"],"patched":["kerberos_5 1.19.3"],"published":"2021-08-23","updated":"2026-10-14","sourceUpdated":"2026-10-14T12:17:15.293","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-37750","references":[{"url":"https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49","label":"cve@mitre.org"},{"url":"https://github.com/krb5/krb5/releases","label":"cve@mitre.org"},{"url":"https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html","label":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MFCLW7D46E4VCREKKH453T5DA4XOLHU2/","label":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20210923-0002/","label":"cve@mitre.org"},{"url":"https://web.mit.edu/kerberos/advisories/","label":"cve@mitre.org"},{"url":"https://www.oracle.com/security-alerts/cpujul2022.html","label":"cve@mitre.org"},{"url":"https://www.starwindsoftware.com/security/sw-20220817-0004/","label":"cve@mitre.org"},{"url":"https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/krb5/krb5/releases","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MFCLW7D46E4VCREKKH453T5DA4XOLHU2/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20210923-0002/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://web.mit.edu/kerberos/advisories/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpujul2022.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.starwindsoftware.com/security/sw-20220817-0004/","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","cve.org"],"epss":0.02166,"epssPercentile":0.81787,"ingestedAt":"2026-10-14T12:29:10.825Z","slug":"CVE-2021-37750","body":"## Overview\n\nThe Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.\n\n## Affected\n\n- `kerberos_5 < 1.18.5`\n- `kerberos_5 >= 1.19.0, < 1.19.3`\n- `fedora = 33`\n- `debian_linux = 9.0`\n- `starwind_virtual_san = v8r13`\n- `communications_cloud_native_core_network_slice_selection_function = 22.1.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `kerberos_5 1.19.3`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.4,"exploitation":0,"ransomware":0},"changes":[]}