CVE-2021-29945: mozilla firefox Incorrect Calculation
CVSS: 6.5v3.1MediumModified
AliasesUBUNTU-CVE-2021-29945DEBIAN-CVE-2021-29945
Published 24-06-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-29945 is a medium (CVSS 6.5) Incorrect Calculation vulnerability in mozilla firefox. EPSS estimates a 1.20% chance of exploitation in the next 30 days, higher than 67.7% of scored vulnerabilities.
CVSS score
6.5/10
010
Medium · v3.1 (NVD)EPSS score
1.20%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 27 · Related 13DLA-2632-1DLA-2633-1DSA-4895-1DSA-4897-1MGASA-2021-0198MGASA-2021-0199OPENSUSE-SU-2021:0621-1OPENSUSE-SU-2021:0644-1OPENSUSE-SU-2024:10600-1OPENSUSE-SU-2024:10601-1OPENSUSE-SU-2024:14572-1RHSA-2021:1350RHSA-2021:1351RHSA-2021:1352RHSA-2021:1353RHSA-2021:1360RHSA-2021:1361RHSA-2021:1362RHSA-2021:1363SUSE-SU-2021:1307-1SUSE-SU-2021:1325-1SUSE-SU-2021:1432-1SUSE-SU-2021:1433-1SUSE-SU-2021:14708-1USN-4926-1USN-4995-1USN-4995-2
Timeline
- 24-06-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
The WebAssembly JIT could miscalculate the size of a return type, which could lead to a null read and result in a crash. *Note: This issue only affected x86-32 platforms. Other platforms are unaffected.*. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.
CVSS metrics
4 scores · 3 sources · 2 versionsMedium 6.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Medium 4.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
1.20%
Chance of exploitation in the next 30 days
Percentile
68%
Versus all other CVEs
30-day change
0.00 pp
From 1.20% on 18-09-2026
18-09-202618-10-2026
EPSS score1.20%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu6 products
- firefox< 88.0+build2-0ubuntu0.16.04.1 | < 88.0+build2-0ubuntu0.18.04.2 | < 88.0+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, < 88 | < 88.0
- firefox_esr≥ unspecified, < 78.10 | < 78.10
- thunderbird≥ unspecified, < 78.10 | < 78.10
Debian2 products
- firefox-esr< 78.10.0esr-1
- thunderbird< 1:78.10.0-1
3 vendors · 11 products
References
14 links- bugzilla.mozilla.org/show_bug.cgi?id=1700690X Refsource MISCIssue TrackingPermissions RequiredVendor Advisory
