DEBIAN-CVE-2021-23969

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    DEBIAN-CVE-2021-23969

    Published: 26 Feb 2021Last Modified: 1 Sept 2026
    Upstream:
    CVE-2021-23969

    Summary:

    Details: As specified in the W3C Content Security Policy draft, when creating a violation report, "User agents need to ensure that the source file is the URL requested by the page, pre-redirects. If that’s not possible, user agents need to strip the URL down to an origin to avoid unintentional leakage." Under certain types of redirects, Firefox incorrectly set the source file to be the destination of the redirects. This was fixed to be the redirect destination's origin. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.

    References: https://security-tracker.debian.org/tracker/CVE-2021-23969

    Affected packages

    Package

    Name: firefox-esr

    Purl: pkg:deb/debian/firefox-esr?arch=source&distro=bookworm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -78.8.0esr-1

    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
    DEBIAN-CVE-2021-23969 | CVE-DB