CVE-2001-1444: Kth Kerberos

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

The Kerberos Telnet protocol, as implemented by KTH Kerberos IV and Kerberos V (Heimdal), does not encrypt authentication and encryption options sent from the server, which allows remote attackers to downgrade authentication and encryption mechanisms via a man-in-the-middle attack.

Affected products

• Kth Kth Kerberos: version 4 only; version 5 only

Published 2001-08-27. Last modified 2026-06-16.