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
02 Description
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
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 0.84% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 57.6% of scored records. A rank, not a probability.
- NVD base score
- 6.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2023-11-21 14:28Z2 YR AGO
- Last updated
- 2025-02-13 17:26Z1 YR AGO
- Reserved
- 2023-11-20
- Assigning CNA
- mozilla
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-125Out-of-bounds ReadBase
- Data version
- 5.1
- Document digest
- 571f0e42b1d9067d9dfb7fe1073e095cc9763a9991855a70cb3db52227757f1f
05 Affected products
06 References
- bugzilla.mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=1841050
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2023-49/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2023-50/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2023-52/
- www.debian.orghttps://www.debian.org/security/2023/dsa-5561
- lists.debian.orghttps://lists.debian.org/debian-lts-announce/2023/11/msg00017.html
- lists.debian.orghttps://lists.debian.org/debian-lts-announce/2023/11/msg00030.html
07 Fixed in
AlmaLinux 8
- firefox Fixed in 115.5.0-1.el8_9.alma.1
- thunderbird Fixed in 115.5.0-1.el8_9.alma.1
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- firefox Fixed in 115.5.0-1.el9_3.alma.1
- firefox-x11 Fixed in 115.5.0-1.el9_3.alma.1
- thunderbird Fixed in 115.5.0-1.el9_3.alma
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- firefox Fixed in 115.5.0-1.el8_9.alma.1
- thunderbird Fixed in 115.5.0-1.el8_9.alma.1
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- firefox Fixed in 115.5.0-1.el9_3.alma.1
- firefox-x11 Fixed in 115.5.0-1.el9_3.alma.1
- thunderbird Fixed in 115.5.0-1.el9_3.alma
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- firefox-esr Fixed in 115.5.0esr-1~deb12u1
- thunderbird Fixed in 1:115.5.0-1~deb12u1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- firefox-esr Fixed in 115.5.0esr-1
- thunderbird Fixed in 1:115.5.0-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- firefox-esr Fixed in 115.5.0esr-1
- thunderbird Fixed in 1:115.5.0-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- mozjs38 No fix yet
- mozjs52 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- firefox Fixed in 120.0+build2-0ubuntu0.20.04.1
- mozjs52 No fix yet
- mozjs68 No fix yet
- thunderbird Fixed in 1:115.5.0+build1-0ubuntu0.20.04.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- mozjs102 No fix yet
- mozjs78 No fix yet
- mozjs91 No fix yet
- thunderbird Fixed in 1:115.5.0+build1-0ubuntu0.22.04.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- mozjs102 No fix yet
- thunderbird Fixed in 1:115.5.0+build1-0ubuntu1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.