Out-of-bounds Read in Mozilla Firefox
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.008 (56.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Mozilla Firefox — versions unspecified
- Mozilla Firefox Esr — versions unspecified
- Mozilla Firefox Esr
- Mozilla Thunderbird — versions unspecified
- Debian Linux — versions 10.0, 11.0, 12.0
Weakness classification (CWE)
References
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking)
- www.mozilla.org/security/advisories/mfsa2023-49/ (Release Notes, Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2023-50/ (Release Notes, Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2023-52/ (Release Notes, Vendor Advisory)
- www.debian.org/security/2023/dsa-5561 (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2023/11/msg00017.html (Mailing List)
- lists.debian.org/debian-lts-announce/2023/11/msg00030.html
Frequently asked questions
- What is CVE-2023-6204?
- CVE-2023-6204 is a medium-severity vulnerability in Mozilla Firefox, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2023-11-21.
- How severe is CVE-2023-6204?
- Medium severity. CVSS v3 base score is 6.5 out of 10.