8.8

CVE-2023-6212: debian debian_linux Out-of-bounds Write

CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2023-6212DEBIAN-CVE-2023-6212CGA-gfqw-wqch-r9mw
Published 21-11-2023Last modified 13-02-2025
Open JSON

Vulnerability summary

CVE-2023-6212 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in debian debian_linux. EPSS estimates a 0.95% chance of exploitation in the next 30 days, higher than 60.7% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
0.95%
0%100%
Low · +0.12 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 35 · Related 10
DLA-3661-1DLA-3674-1DSA-5561-1DSA-5566-1MGASA-2023-0342MGASA-2023-0343

Timeline

  1. 21-11-2023
    PublishedVulnerability first disclosed.
  2. 13-02-2025
    Last modifiedVulnerability information updated.

Description

Memory safety bugs present in Firefox 119, Firefox ESR 115.4, and Thunderbird 115.4. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.95%

Chance of exploitation in the next 30 days

Percentile

61%

Versus all other CVEs

30-day change

+0.12 pp

From 0.83% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.95%

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< 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
Chainguard1 product
  • firefox-esr< 120.0-r0

4 vendors · 15 products

References

15 links
Show all 15 references