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Vulnerabilities

Vulnerability · CVE-2021-36222

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 c…

Published Jul 22, 2021 · catalog updated Oct 14, 2026 · kerberos 5

Check this week

CVE-2021-36222 is not in CISA KEV. FIRST estimates a 10.51% chance of exploitation in the next 30 days. Check whether you run kerberos 5.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
10.51%
Remediation
Advisory link
Affected products
cpe debian/debian linux · cpe mit/kerberos 5 · cpe netapp/active iq unified manager · cpe netapp/oncommand insight · cpe netapp/oncommand workflow automation · cpe netapp/snapcenter

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe debian/debian linux10.0
  • cpe mit/kerberos 5version unspecified
  • cpe netapp/active iq unified managerversion unspecified
  • cpe netapp/oncommand insightversion unspecified
  • cpe netapp/oncommand workflow automationversion unspecified
  • cpe netapp/snapcenterversion unspecified
  • cpe oracle/mysql serverversion unspecified

How to fix CVE-2021-36222

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-36222 is not in CISA KEV. FIRST estimates a 10.51% chance of exploitation in the next 30 days. Check whether you run kerberos 5.

Which versions are affected?

Compare what you have installed with debian/debian linux 10.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-476: NULL Pointer Dereference. EPSS 10.51%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 22, 2021 · NIST NVD

    Detected

    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.

  2. Oct 14, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2021-36222

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-36222

    30-day exploitation probability 10.5%

    first.org
  • NIST NVDVulnerability recordCVE-2021-36222

    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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.