UBUNTU-CVE-2021-43534

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    UBUNTU-CVE-2021-43534

    Published: 8 Dec 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-43534
    Aliases:
    USN-5248-1

    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://ubuntu.com/security/CVE-2021-43534, https://www.mozilla.org/en-US/security/advisories/mfsa2021-48/#CVE-2021-43534, https://www.mozilla.org/en-US/security/advisories/mfsa2021-49/#CVE-2021-43534, https://www.mozilla.org/en-US/security/advisories/mfsa2021-50/#CVE-2021-43534, https://www.mozilla.org/security/advisories/mfsa2021-50/, https://www.mozilla.org/security/advisories/mfsa2021-49/, https://www.mozilla.org/security/advisories/mfsa2021-48/, https://bugzilla.mozilla.org/buglist.cgi?bug_id=1606864%2C1712671%2C1730048%2C1735152, https://ubuntu.com/security/notices/USN-5248-1, https://www.cve.org/CVERecord?id=CVE-2021-43534

    Affected packages

    Package

    Name: thunderbird

    Purl: pkg:deb/ubuntu/thunderbird@1:91.5.0+build1-0ubuntu0.18.04.1?arch=source&distro=bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1:91.5.0+build1-0ubuntu0.18.04.1

    Affected versions

    1:52.4.0+build1-0ubuntu2

    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-2021-43534 | CVE-DB