critical
9.8
CWE
416
Advisory Published
CVE Published
Updated

CVE-2017-7793: Use After Free

First published: Thu Sep 28 2017(Updated: )

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.

Credit: security@mozilla.org security@mozilla.org

Affected SoftwareAffected VersionHow to fix
Mozilla Firefox ESR<52.4
52.4
Mozilla Thunderbird<52.4
52.4
Mozilla Firefox<56
56
Debian Debian Linux=7.0
Debian Debian Linux=8.0
Debian Debian Linux=9.0
Redhat Enterprise Linux=5.0
Redhat Enterprise Linux=6.0
Redhat Enterprise Linux=7.0
Redhat Enterprise Linux Desktop=5.0
Redhat Enterprise Linux Desktop=6.0
Redhat Enterprise Linux Desktop=7.0
Redhat Enterprise Linux Server=5.0
Redhat Enterprise Linux Server=6.0
Redhat Enterprise Linux Server=7.0
Redhat Enterprise Linux Server Aus=7.3
Redhat Enterprise Linux Server Aus=7.4
Redhat Enterprise Linux Server Eus=7.3
Redhat Enterprise Linux Server Eus=7.4
Redhat Enterprise Linux Server Eus=7.5
Redhat Enterprise Linux Workstation=5.0
Redhat Enterprise Linux Workstation=6.0
Redhat Enterprise Linux Workstation=7.0
Mozilla Thunderbird<52.4.0
Mozilla Firefox<56.0
Mozilla Firefox ESR<52.4.0
debian/firefox
131.0.2-2
debian/firefox-esr
115.14.0esr-1~deb11u1
128.3.1esr-1~deb11u1
115.14.0esr-1~deb12u1
128.3.1esr-1~deb12u1
128.3.0esr-2
128.3.1esr-2
debian/thunderbird
1:115.12.0-1~deb11u1
1:115.16.0esr-1~deb11u1
1:115.12.0-1~deb12u1
1:115.16.0esr-1~deb12u1
1:128.2.0esr-1
1:128.3.0esr-1

Remedy

https://bugzilla.mozilla.org/show_bug.cgi?id=1371889

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is CVE-2017-7793?

    CVE-2017-7793 is a use-after-free vulnerability affecting Firefox, Firefox ESR, and Thunderbird.

  • What is the severity of CVE-2017-7793?

    The severity of CVE-2017-7793 is critical with a CVSS score of 9.8.

  • Which software versions are affected by CVE-2017-7793?

    Firefox versions prior to 56, Firefox ESR versions prior to 52.4, and Thunderbird versions prior to 52.4 are affected by CVE-2017-7793.

  • How can I fix CVE-2017-7793?

    Upgrade to Firefox 56 or later, Firefox ESR 52.4 or later, or Thunderbird 52.4 or later to fix CVE-2017-7793.

  • Where can I find more information about CVE-2017-7793?

    You can find more information about CVE-2017-7793 on the Mozilla Bugzilla, Mozilla Security Advisories, and SecurityFocus websites.

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