high
6.5
CWE
125
Advisory Published
Updated

CVE-2023-6204

First published: Tue Nov 21 2023(Updated: )

On some systems—depending on the graphics settings and drivers—it was possible to force an out-of-bounds read and leak memory data into the images created on the canvas element.

On some systems—depending on the graphics settings and drivers—it was possible to force an out-of-bounds read and leak memory data into the images created on the canvas element. This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.

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

Affected SoftwareAffected VersionHow to fix
Mozilla Thunderbird<115.5
115.5
Mozilla Firefox<120
120
Mozilla Firefox ESR<115.5
115.5
Mozilla Firefox<120.0
Mozilla Firefox ESR<115.5.0
Mozilla Thunderbird<115.5
Debian Debian Linux=10.0
Debian Debian Linux=11.0
Debian Debian Linux=12.0
redhat/firefox<115.5
115.5
redhat/thunderbird<115.5
115.5
ubuntu/firefox<120.0+
120.0+
ubuntu/thunderbird<1:115.5.0+
1:115.5.0+
ubuntu/thunderbird<1:115.5.0+
1:115.5.0+
ubuntu/thunderbird<1:115.5.0+
1:115.5.0+
ubuntu/thunderbird<1:115.5.0+
1:115.5.0+
debian/firefox
120.0.1-1
debian/firefox-esr<=91.12.0esr-1~deb10u1<=102.15.0esr-1~deb11u1<=102.15.1esr-1~deb12u1
115.5.0esr-1~deb10u1
115.5.0esr-1~deb11u1
115.5.0esr-1~deb12u1
115.5.0esr-1
debian/thunderbird<=1:91.12.0-1~deb10u1<=1:102.13.1-1~deb11u1<=1:102.15.1-1~deb12u1
1:115.5.0-1~deb10u1
1:115.5.0-1~deb11u1
1:115.5.0-1~deb12u1
1:115.5.1-1

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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 the severity of CVE-2023-6204?

    The severity of CVE-2023-6204 is high.

  • Which systems are affected by CVE-2023-6204?

    CVE-2023-6204 affects systems with Firefox versions < 120, Firefox versions < 115.5, and Thunderbird versions < 115.5.0.

  • How can CVE-2023-6204 be exploited?

    CVE-2023-6204 can be exploited by forcing an out-of-bounds read and leaking memory data into canvas element images.

  • What is the remedy for CVE-2023-6204?

    The remedy for CVE-2023-6204 is to update Firefox to version 120 or higher, Firefox to version 115.5 or higher, or Thunderbird to version 115.5.0 or higher.

  • Where can I find more information about CVE-2023-6204?

    You can find more information about CVE-2023-6204 in the Mozilla bugzilla and security advisories: [Mozilla Bugzilla](https://bugzilla.mozilla.org/show_bug.cgi?id=1841050), [Mozilla Security Advisory 2023-49](https://www.mozilla.org/security/advisories/mfsa2023-49/), [Mozilla Security Advisory 2023-50](https://www.mozilla.org/security/advisories/mfsa2023-50/).

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