CVE-2016-3120: Mit Kerberos 5

Medium severity, CVSS 6.5. EPSS: 4.6% chance of exploitation in the next 30 days.

The validate_as_request function in kdc_util.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.13.6 and 1.4.x before 1.14.3, when restrict_anonymous_to_tgt is enabled, uses an incorrect client data structure, which allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via an S4U2Self request.

Affected products

• Mit Kerberos 5: version 1.13 only; version 1.13.1 only; version 1.13.2 only; version 1.13.3 only; version 1.13.4 only; version 1.13.5 only; …

Published 2016-08-01. Last modified 2026-06-17.