CVE-2006-3410

Tor before 0.1.1.20 creates "internal circuits" primarily consisting of nodes with "useful exit nodes," which allows remote attackers to conduct unspecified statistical attacks...

CVE-2005-2643

Tor 0.1.0.13 and earlier, and experimental versions 0.1.1.4-alpha and earlier, does not reject certain weak keys when using ephemeral Diffie-Hellman DH handshakes, which allows malicious Tor servers to obtain the keys that a client uses for other systems in the circuit...