5.3

CVE-2023-6857: debian debian_linux Race Condition

CVSS: 5.3v3.1MediumModified
AliasesUBUNTU-CVE-2023-6857DEBIAN-CVE-2023-6857CGA-cx7c-6r6h-x6px
Published 19-12-2023Last modified 13-02-2025
Open JSON

Vulnerability summary

CVE-2023-6857 is a medium (CVSS 5.3) Race Condition vulnerability in debian debian_linux. EPSS estimates a 0.66% chance of exploitation in the next 30 days, higher than 50.8% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (NVD)
EPSS score
0.66%
0%100%
Low · 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

When resolving a symlink, a race may occur where the buffer passed to `readlink` may actually be smaller than necessary. *This bug only affects Firefox on Unix-based operating systems (Android, Linux, MacOS). Windows is unaffected.* This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.66%

Chance of exploitation in the next 30 days

Percentile

51%

Versus all other CVEs

30-day change

0.00 pp

From 0.66% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.66%

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