CVE-2011-0491

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    CVE-2011-0491

    Published: 19 Jan 2011Last Modified: 10 Apr 2026

    Summary:

    Details: The tor_realloc function in Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha does not validate a certain size value during memory allocation, which might allow remote attackers to cause a denial of service (daemon crash) via unspecified vectors, related to "underflow errors."

    References: http://blog.torproject.org/blog/tor-02129-released-security-patches, http://archives.seul.org/or/announce/Jan-2011/msg00000.html, http://blog.torproject.org/blog/tor-02129-released-security-patches, https://gitweb.torproject.org/tor.git/blob/refs/heads/release-0.2.2:/ChangeLog, http://www.securityfocus.com/bid/45953, https://exchange.xforce.ibmcloud.com/vulnerabilities/64888, https://trac.torproject.org/projects/tor/ticket/2324

    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