CVE-2021-29975: mozilla firefox
Vulnerability summary
CVE-2021-29975 is a medium (CVSS 6.5) vulnerability in mozilla firefox. EPSS estimates a 0.96% chance of exploitation in the next 30 days, higher than 60.9% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 3 · Related 3Timeline
- 05-08-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
Through a series of DOM manipulations, a message, over which the attacker had control of the text but not HTML or formatting, could be overlaid on top of another domain (with the new domain correctly shown in the address bar) resulting in possible user confusion. This vulnerability affects Firefox < 90.
CVSS metrics
3 scores · 2 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
EPSS trend
Probability
0.96%
Chance of exploitation in the next 30 days
Percentile
61%
Versus all other CVEs
30-day change
0.00 pp
From 0.96% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (bugzilla.mozilla.org)
Maturity: unknown
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu5 products
- firefox< 90.0+build1-0ubuntu0.18.04.1 | < 90.0+build1-0ubuntu0.20.04.1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
- mozjs78All versions (No fix recorded)
Mozilla1 product
- firefox≥ unspecified, < 90 | < 90.0
2 vendors · 6 products