UBUNTU-CVE-2021-28089

    Dashboard / Vulnerabilities / UBUNTU-CVE-2021-28089

    UBUNTU-CVE-2021-28089

    Published: 19 Mar 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-28089
    Aliases:
    USN-5036-1

    Summary:

    Details: Tor before 0.4.5.7 allows a remote participant in the Tor directory protocol to exhaust CPU resources on a target, aka TROVE-2021-001.

    References: https://ubuntu.com/security/CVE-2021-28089, https://blog.torproject.org/node/2009, https://bugs.torproject.org/tpo/core/tor/40286, https://gitlab.torproject.org/tpo/core/tor/-/commit/ede88c374cd61e1e362422718625707a770cffff, https://ubuntu.com/security/notices/USN-5036-1, https://www.cve.org/CVERecord?id=CVE-2021-28089

    Affected packages

    Package

    Name: tor

    Purl: pkg:deb/ubuntu/[email protected]~16.04.3+esm1?arch=source&distro=esm-apps/xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -0.2.9.14-1ubuntu1~16.04.3+esm1

    Affected versions

    0.2.6.10-1ubuntu2
    0.2.7.6-1ubuntu1
    0.2.9.11-1ubuntu1~16.04.1
    0.2.9.14-1ubuntu1~16.04.1
    0.2.9.14-1ubuntu1~16.04.2
    0.2.9.14-1ubuntu1~16.04.3

    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
    UBUNTU-CVE-2021-28089 | CVE-DB