CVE-2006-2940: OpenSSL

High severity, CVSS 7.8. EPSS: 5% chance of exploitation in the next 30 days.

OpenSSL 0.9.7 before 0.9.7l, 0.9.8 before 0.9.8d, and earlier versions allows attackers to cause a denial of service (CPU consumption) via parasitic public keys with large (1) "public exponent" or (2) "public modulus" values in X.509 certificates that require extra time to process when using RSA signature verification.

Affected products

• OpenSSL OpenSSL: version 0.9.1c only; version 0.9.2b only; version 0.9.3 only; version 0.9.3a only; version 0.9.4 only; version 0.9.5 only; …

Published 2006-09-28. Last modified 2026-06-16.