CVE-2021-43534

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    CVE-2021-43534

    Published: 8 Dec 2021Last Modified: 16 Apr 2026

    Summary:

    Details: Mozilla developers and community members reported memory safety bugs present in Firefox 93 and Firefox ESR 91.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

    References: https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html, https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html, https://www.debian.org/security/2021/dsa-5026, https://www.mozilla.org/security/advisories/mfsa2021-48/, https://www.mozilla.org/security/advisories/mfsa2021-49/, https://www.mozilla.org/security/advisories/mfsa2021-50/, https://www.debian.org/security/2022/dsa-5034, https://bugzilla.mozilla.org/buglist.cgi?bug_id=1606864%2C1712671%2C1730048%2C1735152

    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-2021-43534 | CVE-DB