CVE-2009-4212: Mit Kerberos

High severity, CVSS 10.0. EPSS: 7.6% chance of exploitation in the next 30 days.

Multiple integer underflows in the (1) AES and (2) RC4 decryption functionality in the crypto library in MIT Kerberos 5 (aka krb5) 1.3 through 1.6.3, and 1.7 before 1.7.1, allow remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code by providing ciphertext with a length that is too short to be valid.

Affected products

• Mit Kerberos: version 5-1.6.3 only
• Mit Kerberos 5: version 1.3 only; version 1.3.1 only; version 1.3.2 only; version 1.3.3 only; version 1.3.4 only; version 1.3.5 only; …

Published 2010-01-13. Last modified 2026-06-16.