7.5

CVE-2022-38476: mozilla firefox_esr Use After Free

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2022-38476DEBIAN-CVE-2022-38476
Published 22-12-2022Last modified 15-04-2025
Open JSON

Vulnerability summary

CVE-2022-38476 is a high (CVSS 7.5) Use After Free vulnerability in mozilla firefox_esr. EPSS estimates a 0.83% chance of exploitation in the next 30 days, higher than 57% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.83%
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 18 · Related 6
OPENSUSE-SU-2024:12287-1RHSA-2022:6164RHSA-2022:6165RHSA-2022:6166RHSA-2022:6167RHSA-2022:6168

Timeline

  1. 22-12-2022
    PublishedVulnerability first disclosed.
  2. 15-04-2025
    Last modifiedVulnerability information updated.

Description

A data race could occur in the <code>PK11_ChangePW</code> function, potentially leading to a use-after-free vulnerability. In Firefox, this lock protected the data when a user changed their master password. This vulnerability affects Firefox ESR < 102.2 and Thunderbird < 102.2.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.83%

Chance of exploitation in the next 30 days

Percentile

57%

Versus all other CVEs

30-day change

0.00 pp

From 0.83% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.83%

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

Debian2 products
  • firefox-esr< 102.2.0esr-1
  • thunderbird< 1:102.2.0-1
Mozilla2 products
Ubuntu1 product
  • thunderbird< 1:102.2.2+build1-0ubuntu0.18.04.1 | < 1:102.2.2+build1-0ubuntu0.20.04.1 | < 1:102.2.2+build1-0ubuntu0.22.04.1

3 vendors · 5 products

References

9 links