CVE-2022-31742: mozilla firefox Observable Discrepancy
Vulnerability summary
CVE-2022-31742 is a medium (CVSS 6.5) Observable Discrepancy vulnerability in mozilla firefox. EPSS estimates a 0.61% chance of exploitation in the next 30 days, higher than 48.2% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 27 · Related 9Timeline
- 22-12-2022PublishedVulnerability first disclosed.
- 15-04-2025Last modifiedVulnerability information updated.
Description
An attacker could have exploited a timing attack by sending a large number of allowCredential entries and detecting the difference between invalid key handles and cross-origin key handles. This could have led to cross-origin account linking in violation of WebAuthn goals. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.
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
0.61%
Chance of exploitation in the next 30 days
Percentile
48%
Versus all other CVEs
30-day change
+0.02 pp
From 0.59% on 19-09-2026
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< 101.0.1+build1-0ubuntu0.18.04.1 | < 101.0.1+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)
Mozilla3 products
- firefox≥ unspecified, < 101 | < 101
- firefox_esr≥ unspecified, < 91.10 | < 91.10
- thunderbird≥ unspecified, < 91.10 | < 91.10
Debian2 products
- firefox-esr< 91.10.0esr-1
- thunderbird< 1:91.10.0-1
3 vendors · 12 products
References
12 links- www.mozilla.org/security/advisories/mfsa2022-20/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2022-22/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2022-21/Vendor Advisory
