CVE-2003-0139: Certain weaknesses in the implementation of version 4 of the Kerberos protocol (krb4) in the krb5 distribut...

Security readout for executives and security teams

This is an old Kerberos v4 weakness in the krb5 distribution. In specific configurations using triple-DES keys for krb4 services, an attacker could create unauthorized Kerberos v4 tickets. That can undermine authentication trust for affected legacy services, but exposure is limited to environments still running or accepting Kerberos v4. Likely exposure is legacy infrastructure using krb5 with Kerberos v4 enabled, especially krb4 services keyed with triple-DES. Modern environments that have retired Kerberos v4 are unlikely to be affected. The source bundle does not identify current affected products or versions beyond the historical advisories. Prioritize this only if the organization still runs Kerberos v4 or legacy krb5 compatibility. For modern environments, urgency is usually low after verification. For exposed legacy authentication systems, remediation should be scheduled promptly because the impact is unauthorized authentication. Mitigation focus: Check MIT, Red Hat, Debian, and platform advisories for applicable krb5 updates.; Apply vendor-provided krb5 security updates where your platform matches the advisories.; Disable or retire Kerberos v4 support where it is no longer required..

Prepared

Jun 30, 2026, 23:34 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.