CVE-2004-0004: Openca

High severity, CVSS 7.5. EPSS: 2.1% chance of exploitation in the next 30 days.

The libCheckSignature function in crypto-utils.lib for OpenCA 0.9.1.6 and earlier only compares the serial of the signer's certificate and the one in the database, which can cause OpenCA to incorrectly accept a signature if the certificate's chain is trusted by OpenCA's chain directory, allowing remote attackers to spoof requests from other users.

Affected products

• Openca Openca: up to and including 0.9.1.6

Published 2004-02-17. Last modified 2026-06-16.