8.8

CVE-2023-6856: debian debian_linux Out-of-bounds Write

CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2023-6856DEBIAN-CVE-2023-6856CGA-38c7-p4vw-x27c
Published 19-12-2023Last modified 13-02-2025
Open JSON

Vulnerability summary

CVE-2023-6856 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in debian debian_linux. EPSS estimates a 20.63% chance of exploitation in the next 30 days, higher than 97.4% of scored vulnerabilities.

Overall risk
39/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
20.63%
0%100%
High · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 33 · Related 10
DLA-3697-1DLA-3698-1DSA-5581-1DSA-5582-1MGASA-2024-0006MGASA-2024-0012

Timeline

  1. 19-12-2023
    PublishedVulnerability first disclosed.
  2. 13-02-2025
    Last modifiedVulnerability information updated.

Description

The WebGL `DrawElementsInstanced` method was susceptible to a heap buffer overflow when used on systems with the Mesa VM driver. This issue could allow an attacker to perform remote code execution and sandbox escape. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

20.63%

Chance of exploitation in the next 30 days

Percentile

97%

Versus all other CVEs

30-day change

0.00 pp

From 20.63% on 19-09-2026

19-09-202619-10-2026
EPSS score
20.63%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu8 products
  • firefox< 121.0+build1-0ubuntu0.20.04.1
  • mozjs102All versions (No fix recorded)
  • mozjs38All versions (No fix recorded)
  • mozjs52All versions (No fix recorded)
  • mozjs68All versions (No fix recorded)
Debian3 products
  • firefox-esr< 115.6.0esr-1~deb12u1 | < 115.6.0esr-1
  • thunderbird< 1:115.6.0-1~deb12u1 | < 1:115.6.0-1
  • debian_linuxEOL10.0 | 11.0 | 12.0
Mozilla3 products
Chainguard1 product
  • firefox-esr< 121.0-r0

4 vendors · 15 products

References

17 links
Show all 17 references