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    CVE-2023-6204

    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.

    Published:Nov 21, 2023
    Last Modified:Feb 13, 2025
    EPS:Nov 21, 2023
    EPSS Score:0.00279
    CVSS Score:6.5

    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 Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Tus

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

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    CVE-2026-49975 (CVSS 7.5) — Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of …
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    CVE-2026-31431 (CVSS 7.8) — In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating …
    CVE-2026-34757 (CVSS 5.1) — LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network …
    CVE-2026-4775 (CVSS 7.8) — A flaw was found in the libtiff library. A remote attacker could exploit a signed integer overflow vulnerabili…
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    CVE-2026-1940 (CVSS 5.1) — An incomplete fix for CVE-2024-47778 allows an out-of-bounds read in gst_wavparse_adtl_chunk() function. The p…

    References

    https://bugzilla.mozilla.org/show_bug.cgi?id=1841050
    https://lists.debian.org/debian-lts-announce/2023/11/msg00017.html
    https://lists.debian.org/debian-lts-announce/2023/11/msg00030.html
    https://www.debian.org/security/2023/dsa-5561
    https://www.mozilla.org/security/advisories/mfsa2023-49/
    https://www.mozilla.org/security/advisories/mfsa2023-50/
    https://www.mozilla.org/security/advisories/mfsa2023-52/
    https://bugzilla.mozilla.org/show_bug.cgi?id=1841050
    https://lists.debian.org/debian-lts-announce/2023/11/msg00017.html
    https://lists.debian.org/debian-lts-announce/2023/11/msg00030.html
    https://www.debian.org/security/2023/dsa-5561
    https://www.mozilla.org/security/advisories/mfsa2023-49/
    https://www.mozilla.org/security/advisories/mfsa2023-50/
    https://www.mozilla.org/security/advisories/mfsa2023-52/

    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