CVE-2021-29951

    Dashboard / Vulnerabilities / CVE-2021-29951

    CVE-2021-29951

    Published: 24 Jun 2021Last Modified: 10 Mar 2026

    Summary:

    Details: The Mozilla Maintenance Service granted SERVICE_START access to BUILTIN|Users which, in a domain network, grants normal remote users access to start or stop the service. This could be used to prevent the browser update service from operating (if an attacker spammed the 'Stop' command); but also exposed attack surface in the maintenance service. *Note: This issue only affected Windows operating systems older than Win 10 build 1709. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 78.10.1, Firefox < 87, and Firefox ESR < 78.10.1.

    References: , https://www.mozilla.org/security/advisories/mfsa2021-10/, https://www.mozilla.org/security/advisories/mfsa2021-18/, https://www.mozilla.org/security/advisories/mfsa2021-19/, https://bugzilla.mozilla.org/show_bug.cgi?id=1690062

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    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-2021-29951 | CVE-DB