CVE-2013-4208: Putty

Low severity, CVSS 2.1. EPSS: 0.4% chance of exploitation in the next 30 days.

The rsa_verify function in PuTTY before 0.63 (1) does not clear sensitive process memory after use and (2) does not free certain structures containing sensitive process memory, which might allow local users to discover private RSA and DSA keys.

Affected products

• Putty Putty: version 0.45 only; version 0.46 only; version 0.47 only; version 0.48 only; version 0.49 only; version 0.50 only; …
• Simon Tatham Putty: up to and including 0.62; version 0.53 only

Published 2013-08-19. Last modified 2026-06-16.