CVE-2021-38496

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    CVE-2021-38496

    Published: 3 Nov 2021Last Modified: 16 Apr 2026

    Summary:

    Details: During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.

    References: https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html, https://www.mozilla.org/security/advisories/mfsa2021-43/, https://www.mozilla.org/security/advisories/mfsa2021-44/, https://www.mozilla.org/security/advisories/mfsa2021-45/, https://www.mozilla.org/security/advisories/mfsa2021-46/, https://www.mozilla.org/security/advisories/mfsa2021-47/, https://bugzilla.mozilla.org/show_bug.cgi?id=1725335, https://www.debian.org/security/2022/dsa-5034

    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-2021-38496 | CVE-DB