UBUNTU-CVE-2021-29974

    Dashboard / Vulnerabilities / UBUNTU-CVE-2021-29974

    UBUNTU-CVE-2021-29974

    Published: 15 Jul 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-29974
    Aliases:
    USN-5011-1

    Summary:

    Details: When network partitioning was enabled, e.g. as a result of Enhanced Tracking Protection settings, a TLS error page would allow the user to override an error on a domain which had specified HTTP Strict Transport Security (which implies that the error should not be override-able.) This issue did not affect the network connections, and they were correctly upgraded to HTTPS automatically. This vulnerability affects Firefox < 90.

    References: https://ubuntu.com/security/CVE-2021-29974, https://www.mozilla.org/en-US/security/advisories/mfsa2021-28/#CVE-2021-29974, https://ubuntu.com/security/notices/USN-5011-1, https://www.cve.org/CVERecord?id=CVE-2021-29974

    Affected packages

    Package

    Name: firefox

    Purl: pkg:deb/ubuntu/[email protected]+build1-0ubuntu0.18.04.1?arch=source&distro=bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -90.0+build1-0ubuntu0.18.04.1

    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-2021-29974 | CVE-DB