CVE-2007-6721: Bouncycastle Bc-Java

High severity, CVSS 10.0. EPSS: 2.4% chance of exploitation in the next 30 days.

The Legion of the Bouncy Castle Java Cryptography API before release 1.38, as used in Crypto Provider Package before 1.36, has unknown impact and remote attack vectors related to "a Bleichenbacher vulnerability in simple RSA CMS signatures without signed attributes."

Affected products

• Bouncycastle Bc-Java: up to and including 1.37; version 1.01 only; version 1.02 only; version 1.03 only; version 1.04 only; version 1.05 only; …
• Bouncycastle Bouncy-Castle-Crypto-Package: up to and including 1.35; version 1.0 only; version 1.01 only; version 1.02 only; version 1.03 only; version 1.3.1 only; …

Published 2009-03-30. Last modified 2026-06-16.