CVE-2022-45142: Heimdal Project Heimdal

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

The fix for CVE-2022-3437 included changing memcmp to be constant time and a workaround for a compiler bug by adding "!= 0" comparisons to the result of memcmp. When these patches were backported to the heimdal-7.7.1 and heimdal-7.8.0 branches (and possibly other branches) a logic inversion sneaked in causing the validation of message integrity codes in gssapi/arcfour to be inverted.

Affected products

• Heimdal Project Heimdal: version 7.7.1 only; version 7.8.0 only

Published 2023-03-06. Last modified 2026-06-17.