CVE-2021-29985: mozilla firefox Use After Free
CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2021-29985DEBIAN-CVE-2021-29985
Published 17-08-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-29985 is a high (CVSS 8.8) Use After Free vulnerability in mozilla firefox. EPSS estimates a 1.45% chance of exploitation in the next 30 days, higher than 72.9% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
8.8/10
010
High · v3.1 (NVD)EPSS score
1.45%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 37 · Related 23DLA-2740-1DLA-2745-1DSA-4956-1DSA-4959-1MGASA-2021-0403MGASA-2021-0407OPENSUSE-SU-2021:1184-1OPENSUSE-SU-2021:1367-1OPENSUSE-SU-2021:2774-1OPENSUSE-SU-2021:2874-1OPENSUSE-SU-2021:3331-1OPENSUSE-SU-2021:3451-1OPENSUSE-SU-2024:10600-1OPENSUSE-SU-2024:10601-1OPENSUSE-SU-2024:14572-1RHSA-2021:3154RHSA-2021:3155RHSA-2021:3156RHSA-2021:3157RHSA-2021:3159RHSA-2021:3160RHSA-2021:3161RHSA-2021:3162SUSE-SU-2021:14782-1SUSE-SU-2021:14821-1SUSE-SU-2021:14826-1SUSE-SU-2021:2691-1SUSE-SU-2021:2694-1SUSE-SU-2021:2774-1SUSE-SU-2021:2874-1SUSE-SU-2021:3191-1SUSE-SU-2021:3331-1SUSE-SU-2021:3451-1SUSE-SU-2022:1577-1SUSE-SU-2022:1582-1USN-5037-1USN-5058-1
Timeline
- 17-08-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
A use-after-free vulnerability in media channels could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
CVSS metrics
4 scores · 3 sources · 2 versionsHigh 8.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSourcesAll 3 agree
- 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
Medium 6.8Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
1.45%
Chance of exploitation in the next 30 days
Percentile
73%
Versus all other CVEs
30-day change
0.00 pp
From 1.45% on 19-09-2026
19-09-202619-10-2026
EPSS score1.45%
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 causeAffected systems
Ubuntu6 products
- firefox< 91.0+build2-0ubuntu0.18.04.1 | < 91.0+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, < 91 | < 91.0
- firefox_esr≥ unspecified, < 78.13 | < 78.13.0
- thunderbird≥ unspecified, < 78.13 | ≥ unspecified, < 91 | < 78.13.0
Debian2 products
- firefox-esr< 78.13.0esr-1
- thunderbird< 1:78.13.0-1
3 vendors · 11 products
