CVE-2022-29916: mozilla firefox
Vulnerability summary
CVE-2022-29916 is a medium (CVSS 6.5) vulnerability in mozilla firefox. EPSS estimates a 0.73% chance of exploitation in the next 30 days, higher than 53.4% of scored vulnerabilities. 4 public exploits are recorded.
Advisory lineage
Upstream 0 · Downstream 28 · Related 10Timeline
- 22-12-2022PublishedVulnerability first disclosed.
- 15-04-2025Last modifiedVulnerability information updated.
Description
Firefox behaved slightly differently for already known resources when loading CSS resources involving CSS variables. This could have been used to probe the browser history. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- NVDNIST6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
EPSS trend
Probability
0.73%
Chance of exploitation in the next 30 days
Percentile
53%
Versus all other CVEs
30-day change
+0.01 pp
From 0.72% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
4 foundExploit Reference (mozilla.org)
Maturity: unknown
Exploit Reference (mozilla.org)
Maturity: unknown
Exploit Reference (mozilla.org)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Ubuntu7 products
- firefox< 100.0+build2-0ubuntu0.18.04.1 | < 100.0+build2-0ubuntu0.20.04.1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
- mozjs78All versions (No fix recorded)
Mozilla3 products
- firefox≥ unspecified, < 100 | < 100.0
- firefox_esr≥ unspecified, < 91.9 | < 91.9
- thunderbird≥ unspecified, < 91.9 | < 91.9
Debian2 products
- firefox-esr< 91.9.0esr-1
- thunderbird< 1:91.9.0-1
3 vendors · 12 products
