UBUNTU-CVE-2021-23979

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    UBUNTU-CVE-2021-23979

    Published: 26 Feb 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-23979
    Aliases:
    USN-4756-1

    Summary:

    Details: Mozilla developers reported memory safety bugs present in Firefox 85. 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 < 86.

    References: https://ubuntu.com/security/CVE-2021-23979, https://www.mozilla.org/en-US/security/advisories/mfsa2021-07/#CVE-2021-23979, https://bugzilla.mozilla.org/buglist.cgi?bug_id=1663222%2C1666607%2C1672120%2C1678463%2C1678927%2C1679560%2C1681297%2C1681684%2C1683490%2C1684377%2C1684902, https://www.mozilla.org/security/advisories/mfsa2021-07/, https://ubuntu.com/security/notices/USN-4756-1, https://www.cve.org/CVERecord?id=CVE-2021-23979

    Affected packages

    Package

    Name: firefox

    Purl: pkg:deb/ubuntu/[email protected]+build3-0ubuntu0.16.04.1?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -86.0+build3-0ubuntu0.16.04.1

    Affected versions

    41.0.2+build2-0ubuntu1

    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-2021-23979 | CVE-DB