UBUNTU-CVE-2021-23997

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    UBUNTU-CVE-2021-23997

    Published: 19 Apr 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-23997
    Aliases:
    USN-4926-1

    Summary:

    Details: Due to unexpected data type conversions, a use-after-free could have occurred when interacting with the font cache. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox < 88.

    References: https://ubuntu.com/security/CVE-2021-23997, https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/#CVE-2021-23997, https://ubuntu.com/security/notices/USN-4926-1, https://www.cve.org/CVERecord?id=CVE-2021-23997

    Affected packages

    Package

    Name: firefox

    Purl: pkg:deb/ubuntu/[email protected]+build2-0ubuntu0.16.04.1?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -88.0+build2-0ubuntu0.16.04.1

    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-2021-23997 | CVE-DB