CVE-2021-29964

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    CVE-2021-29964

    Published: 24 Jun 2021Last Modified: 10 Mar 2026

    Summary:

    Details: A locally-installed hostile program could send `WM_COPYDATA` messages that Firefox would process incorrectly, leading to an out-of-bounds read. *This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 78.11, Firefox < 89, and Firefox ESR < 78.11.

    References: , https://www.mozilla.org/security/advisories/mfsa2021-23/, https://www.mozilla.org/security/advisories/mfsa2021-24/, https://www.mozilla.org/security/advisories/mfsa2021-26/, https://bugzilla.mozilla.org/show_bug.cgi?id=1706501

    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-2021-29964 | CVE-DB