CVE-2023-6204: debian debian_linux Out-of-bounds Read
CVSS: 6.5v3.1MediumModified
AliasesUBUNTU-CVE-2023-6204DEBIAN-CVE-2023-6204CGA-fhw9-9rfm-5f3gCGA-qm8m-2jr2-36mh
Published 21-11-2023Last modified 13-02-2025
Vulnerability summary
CVE-2023-6204 is a medium (CVSS 6.5) Out-of-bounds Read vulnerability in debian debian_linux. EPSS estimates a 0.84% chance of exploitation in the next 30 days, higher than 57.4% of scored vulnerabilities.
CVSS score
6.5/10
010
Medium · v3.1 (NVD)EPSS score
0.84%
0%100%
Low · +0.01 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 35 · Related 10DLA-3661-1DLA-3674-1DSA-5561-1DSA-5566-1MGASA-2023-0342MGASA-2023-0343OPENSUSE-SU-2024:13459-1OPENSUSE-SU-2024:13468-1OPENSUSE-SU-2024:14572-1RHSA-2023:7499RHSA-2023:7500RHSA-2023:7501RHSA-2023:7502RHSA-2023:7503RHSA-2023:7504RHSA-2023:7505RHSA-2023:7506RHSA-2023:7507RHSA-2023:7508RHSA-2023:7509RHSA-2023:7510RHSA-2023:7511RHSA-2023:7512RHSA-2023:7547RHSA-2023:7569RHSA-2023:7570RHSA-2023:7573RHSA-2023:7574RHSA-2023:7577SUSE-SU-2023:4588-1SUSE-SU-2023:4912-1SUSE-SU-2023:4928-1SUSE-SU-2023:4929-1USN-6509-1USN-6515-1CGA-3783-7VWH-H29G
Timeline
- 21-11-2023PublishedVulnerability first disclosed.
- 13-02-2025Last modifiedVulnerability information updated.
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 affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.
CVSS metrics
4 scores · 4 sources · 1 versionMedium 6.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:NSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- OSV · ChainguardEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
EPSS trend
Probability
0.84%
Chance of exploitation in the next 30 days
Percentile
57%
Versus all other CVEs
30-day change
+0.01 pp
From 0.83% on 21-09-2026
21-09-202621-10-2026
EPSS score0.84%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu8 products
- firefox< 120.0+build2-0ubuntu0.20.04.1
- mozjs102All versions (No fix recorded)
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
Debian3 products
- firefox-esr< 115.5.0esr-1~deb12u1 | < 115.5.0esr-1
- thunderbird< 1:115.5.0-1~deb12u1 | < 1:115.5.0-1
- debian_linuxEOL10.0 | 11.0 | 12.0
Mozilla3 products
- firefox≥ unspecified, < 120 | < 120.0
- firefox_esr≥ unspecified, < 115.5.0 | < 115.5.0
- thunderbird≥ unspecified, < 115.5 | < 115.5
Chainguard1 product
- firefox-esr< 120.0-r0
4 vendors · 15 products
