What’s Vulnerable › Vulnerabilities

CVE-2011-4895

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2011-12-23 · updated 2026-06-16
• Weakness: CWE-200

Description

Tor before 0.2.2.34, when configured as a bridge, sets up circuits through a process different from the process used by a client, which makes it easier for remote attackers to enumerate bridges by observing circuit building.

Affected products

• Tor: through 0.2.2.33; 0.0.2, 0.0.3, 0.0.4, 0.0.5, 0.0.6, 0.0.6.1 (+222)

References

• https://blog.torproject.org/blog/tor-02234-released-security-patches
• https://blog.torproject.org/blog/tor-02234-released-security-patches

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