CVE-2011-2768

    Dashboard / Vulnerabilities / CVE-2011-2768

    CVE-2011-2768

    Published: 23 Dec 2011Last Modified: 10 Apr 2026

    Summary:

    Details: Tor before 0.2.2.34, when configured as a client or bridge, sends a TLS certificate chain as part of an outgoing OR connection, which allows remote relays to bypass intended anonymity properties by reading this chain and then determining the set of entry guards that the client or bridge had selected.

    References: http://www.debian.org/security/2011/dsa-2331, https://blog.torproject.org/blog/tor-02234-released-security-patches, https://blog.torproject.org/blog/tor-02234-released-security-patches

    Affected packages

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High