CVE-2021-23975

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    CVE-2021-23975

    Published: 26 Feb 2021Last Modified: 10 Mar 2026

    Summary:

    Details: The developer page about:memory has a Measure function for exploring what object types the browser has allocated and their sizes. When this function was invoked we incorrectly called the sizeof function, instead of using the API method that checks for invalid pointers. This vulnerability affects Firefox < 86.

    References: , https://security.gentoo.org/glsa/202104-10, https://www.mozilla.org/security/advisories/mfsa2021-07/, https://bugzilla.mozilla.org/show_bug.cgi?id=1685145

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    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
    CVE-2021-23975 | CVE-DB