CVE-2021-34549

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    CVE-2021-34549

    Published: 29 Jun 2021Last Modified: 8 Jul 2026

    Summary:

    Details: An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-005. Hashing is mishandled for certain retrieval of circuit data. Consequently. an attacker can trigger the use of an attacker-chosen circuit ID to cause algorithm inefficiency.

    References: https://blog.torproject.org/node/2041, https://security.gentoo.org/glsa/202107-25, https://gitlab.torproject.org/tpo/core/tor/-/issues/40391

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -b925cef1e39e98d1b1a329c8945772a2a1c2d1b8

    Affected versions

    tor-0.4.6.4-rc
    tor-0.4.6.3-rc
    tor-0.4.5.8
    tor-0.4.6.2-alpha
    tor-0.4.6.1-alpha
    tor-0.4.4.8
    tor-0.4.5.7
    tor-0.4.5.6
    tor-0.4.4.7
    tor-0.4.5.5-rc
    tor-0.4.5.4-rc
    tor-0.4.5.3-rc
    tor-0.4.5.2-alpha
    tor-0.4.6.0-alpha-dev
    tor-0.4.4.6
    tor-0.4.5.1-alpha
    tor-0.4.4.5
    tor-0.4.4.4-rc
    tor-0.4.4.3-alpha
    tor-0.4.4.2-alpha
    tor-0.4.4.1-alpha
    tor-0.4.5.0-alpha-dev
    tor-0.4.4.0-alpha-dev
    tor-0.4.3.2-alpha
    tor-0.4.3.1-alpha
    tor-0.4.3.0-alpha-dev
    tor-0.4.2.2-alpha
    tor-0.4.2.1-alpha
    tor-0.4.1.2-alpha
    tor-0.4.1.1-alpha
    tor-0.4.1.0-alpha-dev
    tor-0.4.0.1-alpha

    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
    CVE-2021-34549 | CVE-DB