High
Security advisory
ec_verify in kdc/kdc_preauth_ec.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.4 and 1.19.x before 1.19.2 allows remote attackers to cause a NULL pointer dereference and daemon crash. This occurs because a return value is not properly managed in a certain situation.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-36222
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:19 UTC · Revision 1
Source evidence
ec_verify in kdc/kdc_preauth_ec.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.4 and 1.19.x before 1.19.2 allows remote attackers to cause a NULL pointer dereference and daemon crash. This occurs because a return value is not properly managed in a certain situation.
osv:CVE-2021-36222
Complete source record
{
"id": "b1caba8a64078c6ba29ff3fa98678a839c2d7ad3d40886c0cbabf5e10ad02cb0",
"url": "https://osv.dev/vulnerability/CVE-2021-36222",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-36222",
"summary": "ec_verify in kdc/kdc_preauth_ec.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.4 and 1.19.x before 1.19.2 allows remote attackers to cause a NULL pointer dereference and daemon crash. This occurs because a return value is not properly managed in a certain situation.",
"evidence": "osv:CVE-2021-36222",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-36222",
"aliases": [
"CVE-2021-36222"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/krb5/krb5",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "05405c3d24c2d84ba79e355ae82f4b1b9884938c"
},
{
"fixed": "eb0a1e051c9133da28613563c4b530bf8d875624"
},
{
"fixed": "fc98f520caefff2e5ee9a0026fdf5109944b3562"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.18.4"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.19.0"
},
{
"fixed": "1.19.2"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "fc98f520caefff2e5ee9a0026fdf5109944b3562"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"krb5-1.19.1-final",
"krb5-1.19-final",
"krb5-1.19-beta2",
"krb5-1.19-beta1",
"krb5-1.18.3-final",
"krb5-1.18.2-final",
"krb5-1.18.1-final",
"krb5-1.18-final",
"krb5-1.18-beta2",
"krb5-1.18-beta1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-36222.json",
"vanir_signatures": [
{
"id": "CVE-2021-36222-4eafeb47",
"digest": {
"threshold": 0.9,
"line_hashes": [
"11212649172673180521140604104188591304",
"228806048721091709572489333951828356198",
"321289942291638231764076182789317623244",
"93469301882783218346945084207915710111"
]
},
"source": "https://github.com/krb5/krb5/commit/fc98f520caefff2e5ee9a0026fdf5109944b3562",
"target": {
"file": "src/kdc/kdc_preauth_ec.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2021-36222-f3fc596a",
"digest": {
"length": 2350,
"function_hash": "137210320503581614737329061627982532169"
},
"source": "https://github.com/krb5/krb5/commit/fc98f520caefff2e5ee9a0026fdf5109944b3562",
"target": {
"file": "src/kdc/kdc_preauth_ec.c",
"function": "ec_verify"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-24T14:12:11Z"
}
},
{
"ranges": [
{
"repo": "https://github.com/mysql/mysql-server",
"type": "GIT",
"events": [
{
"introduced": "270fd3411e3d671a73ed9725940a30080f59ce6d"
},
{
"last_affected": "beb865a960b9a8a16cf999c323e46c5b0c67f21f"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "8.0.0"
},
{
"last_affected": "8.0.26"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-36222.json"
}
}
],
"modified": "2026-10-24T14:12:11.484451744Z",
"provider": "osv",
"references": [
"https://cert-portal.siemens.com/productcert/html/ssa-398330.html",
"https://github.com/krb5/krb5/releases",
"https://security.netapp.com/advisory/ntap-20211022-0003/",
"https://security.netapp.com/advisory/ntap-20211104-0007/",
"https://web.mit.edu/kerberos/advisories/",
"https://www.debian.org/security/2021/dsa-4944",
"https://github.com/krb5/krb5/commit/fc98f520caefff2e5ee9a0026fdf5109944b3562",
"https://www.oracle.com/security-alerts/cpuoct2021.html"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:*"
],
"vendor_product": "mit:kerberos_5",
"extracted_events": [
{
"range": [
{
"fixed": "1.18.4"
},
{
"introduced": "1.19.0"
},
{
"fixed": "1.19.2"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "10.0"
},
{
"last_affected": "10.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-36222",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 443356,
"published_at": "2021-07-22T18:15:23.337+00:00"
}