CVE-2022-38477: mozilla firefox Out-of-bounds Write
Vulnerability summary
CVE-2022-38477 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in mozilla firefox. EPSS estimates a 0.89% chance of exploitation in the next 30 days, higher than 58.8% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 21 · Related 9Timeline
- 22-12-2022PublishedVulnerability first disclosed.
- 15-04-2025Last modifiedVulnerability information updated.
Description
Mozilla developer Nika Layzell and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 103 and Firefox ESR 102.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 102.2, Thunderbird < 102.2, and Firefox < 104.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.89%
Chance of exploitation in the next 30 days
Percentile
59%
Versus all other CVEs
30-day change
0.00 pp
From 0.89% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu7 products
- firefox< 104.0+build3-0ubuntu0.18.04.1 | < 104.0+build3-0ubuntu0.20.04.1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
- mozjs78All versions (No fix recorded)
Mozilla3 products
- firefox≥ unspecified, < 104 | < 104.0
- firefox_esr≥ unspecified, < 102.2 | < 102.2
- thunderbird≥ unspecified, < 102.2 | < 102.2
Debian2 products
- firefox-esr< 102.2.0esr-1
- thunderbird< 1:102.2.0-1
3 vendors · 12 products
References
10 links- www.mozilla.org/security/advisories/mfsa2022-33/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2022-36/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2022-34/Vendor Advisory
- bugzilla.mozilla.org/buglist.cgi?bug_id=1760611%2C1770219%2C1771159%2C1773363Issue TrackingNot ApplicableVendor Advisory
