CVE-2011-0015: Tor

Medium severity, CVSS 5.0. EPSS: 3.1% chance of exploitation in the next 30 days.

Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha does not properly check the amount of compression in zlib-compressed data, which allows remote attackers to cause a denial of service via a large compression factor.

Affected products

• Tor Tor: up to and including 0.2.1.28; version 0.0.2 only; version 0.0.2_pre13 only; version 0.0.2_pre14 only; version 0.0.2_pre15 only; version 0.0.2_pre16 only; …

Published 2011-01-19. Last modified 2026-06-16.