CVE-2004-0371: Kth Heimdal

Medium severity, CVSS 5.0. EPSS: 1.5% chance of exploitation in the next 30 days.

Heimdal 0.6.x before 0.6.1 and 0.5.x before 0.5.3 does not properly perform certain consistency checks for cross-realm requests, which allows remote attackers with control of a realm to impersonate others in the cross-realm trust path.

Affected products

• Kth Heimdal: version 0.4a only; version 0.4b only; version 0.4c only; version 0.4d only; version 0.4e only; version 0.5 only; …

Published 2004-05-04. Last modified 2026-06-16.