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    CVE-2021-38509

    Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker's choosing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

    Published:Nov 2, 2021
    Last Modified:Nov 21, 2024
    EPS:Dec 8, 2021
    EPSS Score:0.00398
    CVSS Score:4.3

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Firefox Esr
    Vendor
    Mozilla
    Product
    Thunderbird
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Eus

    Exploits

    No exploit reference

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    References

    https://bugzilla.mozilla.org/show_bug.cgi?id=1718571
    https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html
    https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
    https://security.gentoo.org/glsa/202202-03
    https://security.gentoo.org/glsa/202208-14
    https://www.debian.org/security/2021/dsa-5026
    https://www.debian.org/security/2022/dsa-5034
    https://www.mozilla.org/security/advisories/mfsa2021-48/
    https://www.mozilla.org/security/advisories/mfsa2021-49/
    https://www.mozilla.org/security/advisories/mfsa2021-50/
    https://bugzilla.mozilla.org/show_bug.cgi?id=1718571
    https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html
    https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
    https://security.gentoo.org/glsa/202202-03
    https://security.gentoo.org/glsa/202208-14
    https://www.debian.org/security/2021/dsa-5026
    https://www.debian.org/security/2022/dsa-5034
    https://www.mozilla.org/security/advisories/mfsa2021-48/
    https://www.mozilla.org/security/advisories/mfsa2021-49/
    https://www.mozilla.org/security/advisories/mfsa2021-50/

    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