Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-36222

CVE-2021-36222HIGH

n/a n/a — 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.…

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .1051   95.7     —

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Jul 7   Reserved by mitre
  Jul 22  Published (CNA: mitre)
  Oct 14  ENRICHED — CVE-2021-36222. Received CVSS 7.5 and CPE data from NVD.

CWE-476 · CNA: mitre · CVSS v3.1 · 8 references · NVD status: Modified

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 7, 2021	Reserved	Reserved by mitre
July 22, 2021	Published	Published (CNA: mitre)
October 14, 2026	ENRICHED	ENRICHED — CVE-2021-36222. Received CVSS 7.5 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-476

References (8)

https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://github.com/krb5/krb5/commit/fc98f520caefff2e5ee9a0026fdf5109944b3562 [Patch, Third Party Advisory]
https://github.com/krb5/krb5/releases [Release Notes, Third Party Advisory]
https://security.netapp.com/advisory/ntap-20211022-0003/ [Third Party Advisory]
https://security.netapp.com/advisory/ntap-20211104-0007/ [Third Party Advisory]
https://web.mit.edu/kerberos/advisories/ [Not Applicable]
https://www.debian.org/security/2021/dsa-4944 [Third Party Advisory]
https://www.oracle.com/security-alerts/cpuoct2021.html [Patch, Third Party Advisory]

Authoritative record: CVE-2021-36222 at cve.org

Weaknesses: CWE-476

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-36222 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.