CVE-2003-0138: Mit Kerberos

High severity, CVSS 7.5. EPSS: 4.3% chance of exploitation in the next 30 days.

Version 4 of the Kerberos protocol (krb4), as used in Heimdal and other packages, allows an attacker to impersonate any principal in a realm via a chosen-plaintext attack.

Affected products

• Mit Kerberos: version 4 only

Published 2003-03-24. Last modified 2026-06-16.