5.3

CVE-2021-29955: mozilla firefox Injection

CVSS: 5.3v3.1MediumModified
AliasesUBUNTU-CVE-2021-29955DEBIAN-CVE-2021-29955
Published 24-06-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-29955 is a medium (CVSS 5.3) Injection vulnerability in mozilla firefox. EPSS estimates a 1.48% chance of exploitation in the next 30 days, higher than 73.5% 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
1.48%
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 2
DLA-2607-1DSA-4874-1

Timeline

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

Description

A transient execution vulnerability, named Floating Point Value Injection (FPVI) allowed an attacker to leak arbitrary memory addresses and may have also enabled JIT type confusion attacks. (A related vulnerability, Speculative Code Store Bypass (SCSB), did not affect Firefox.). This vulnerability affects Firefox ESR < 78.9 and Firefox < 87.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.48%

Chance of exploitation in the next 30 days

Percentile

74%

Versus all other CVEs

30-day change

0.00 pp

From 1.48% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.48%

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< 87.0+build3-0ubuntu0.18.04.2
  • mozjs38All versions (No fix recorded)
  • mozjs52All versions (No fix recorded)
  • mozjs68All versions (No fix recorded)
  • mozjs78All versions (No fix recorded)
Mozilla2 products
Debian1 product
  • firefox-esr< 78.9.0esr-1

3 vendors · 8 products

References

8 links