CVE-2021-23977

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    CVE-2021-23977

    Published: 26 Feb 2021Last Modified: 10 Mar 2026

    Summary:

    Details: Firefox for Android suffered from a time-of-check-time-of-use vulnerability that allowed a malicious application to read sensitive data from application directories. Note: This issue is only affected Firefox for Android. Other operating systems are unaffected. 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=1684761

    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-2021-23977 | CVE-DB