CVE-2004-2721: Heiko Stamer Openskat

Medium severity, CVSS 4.3. EPSS: 1.7% chance of exploitation in the next 30 days.

The CheckGroup function in openSkat VTMF before 2.1 generates public key pairs in which the "p" variable might not be prime, which allows remote attackers to determine the private key and decrypt messages.

Affected products

• Heiko Stamer Openskat: up to and including 2.0

Published 2004-12-31. Last modified 2026-06-16.