UBUNTU-CVE-2021-29984

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    UBUNTU-CVE-2021-29984

    Published: 11 Aug 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-29984

    Summary:

    Details: Instruction reordering resulted in a sequence of instructions that would cause an object to be incorrectly considered during garbage collection. This led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.

    References: https://ubuntu.com/security/CVE-2021-29984, https://www.mozilla.org/en-US/security/advisories/mfsa2021-33/#CVE-2021-29984, https://www.mozilla.org/en-US/security/advisories/mfsa2021-34/#CVE-2021-29984, https://ubuntu.com/security/notices/USN-5037-1, https://ubuntu.com/security/notices/USN-5058-1, https://www.cve.org/CVERecord?id=CVE-2021-29984

    Affected packages

    Package

    Name: firefox

    Purl: pkg:deb/ubuntu/[email protected]+build2-0ubuntu0.18.04.1?arch=source&distro=bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -91.0+build2-0ubuntu0.18.04.1

    Affected versions

    56.0+build6-0ubuntu1

    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-2021-29984 | CVE-DB