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    CVE-2017-7793

    A use-after-free vulnerability can occur in the Fetch API when the worker or the associated window are freed when still in use, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.

    Published:Sep 28, 2017
    Last Modified:Nov 25, 2025
    EPS:Jun 11, 2018
    EPSS Score:0.0257
    CVSS Score:9.8

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Thunderbird
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Desktop
    Vendor
    Redhat
    Product
    Enterprise Linux Server
    Vendor
    Redhat
    Product
    Enterprise Linux Server Aus
    Vendor
    Redhat
    Product
    Enterprise Linux Server Eus
    Vendor
    Redhat
    Product
    Enterprise Linux Workstation

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    http://www.securityfocus.com/bid/101055
    http://www.securitytracker.com/id/1039465
    https://access.redhat.com/errata/RHSA-2017:2831
    https://access.redhat.com/errata/RHSA-2017:2885
    https://bugzilla.mozilla.org/show_bug.cgi?id=1371889
    https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html
    https://security.gentoo.org/glsa/201803-14
    https://www.debian.org/security/2017/dsa-3987
    https://www.debian.org/security/2017/dsa-4014
    https://www.mozilla.org/security/advisories/mfsa2017-21/
    https://www.mozilla.org/security/advisories/mfsa2017-22/
    https://www.mozilla.org/security/advisories/mfsa2017-23/
    http://www.securityfocus.com/bid/101055
    http://www.securitytracker.com/id/1039465
    https://access.redhat.com/errata/RHSA-2017:2831
    https://access.redhat.com/errata/RHSA-2017:2885
    https://bugzilla.mozilla.org/show_bug.cgi?id=1371889
    https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html
    https://security.gentoo.org/glsa/201803-14
    https://www.debian.org/security/2017/dsa-3987
    https://www.debian.org/security/2017/dsa-4014
    https://www.mozilla.org/security/advisories/mfsa2017-21/
    https://www.mozilla.org/security/advisories/mfsa2017-22/
    https://www.mozilla.org/security/advisories/mfsa2017-23/

    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