7.5

CVE-2021-29952: mozilla firefox Race Condition

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2021-29952USN-4942-1
Published 24-06-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-29952 is a high (CVSS 7.5) Race Condition vulnerability in mozilla firefox. EPSS estimates a 0.74% chance of exploitation in the next 30 days, higher than 53.5% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.74%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2024:10600-1OPENSUSE-SU-2024:14572-1

Timeline

  1. 24-06-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

When Web Render components were destructed, a race condition could have caused undefined behavior, and we presume that with enough effort may have been exploitable to run arbitrary code. This vulnerability affects Firefox < 88.0.1 and Firefox for Android < 88.1.3.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.74%

Chance of exploitation in the next 30 days

Percentile

54%

Versus all other CVEs

30-day change

+0.01 pp

From 0.73% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.74%

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

Ubuntu5 products
  • firefox< 88.0.1+build1-0ubuntu0.18.04.2 | < 88.0.1+build1-0ubuntu0.20.04.2
  • mozjs38All versions (No fix recorded)
  • mozjs52All versions (No fix recorded)
  • mozjs68All versions (No fix recorded)
  • mozjs78All versions (No fix recorded)
Mozilla2 products

2 vendors · 7 products

References

6 links