CVE-2021-23981: mozilla firefox Out-of-bounds Write
CVSS: 8.1v3.1HighModified
AliasesUBUNTU-CVE-2021-23981DEBIAN-CVE-2021-23981
Published 31-03-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-23981 is a high (CVSS 8.1) Out-of-bounds Write vulnerability in mozilla firefox. EPSS estimates a 1.15% chance of exploitation in the next 30 days, higher than 66.2% of scored vulnerabilities.
CVSS score
8.1/10
010
High · v3.1 (NVD)EPSS score
1.15%
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-2607-1DLA-2609-1DSA-4874-1DSA-4876-1MGASA-2021-0163MGASA-2021-0164OPENSUSE-SU-2021:0487-1OPENSUSE-SU-2021:0580-1OPENSUSE-SU-2024:10600-1OPENSUSE-SU-2024:10601-1OPENSUSE-SU-2024:14572-1RHSA-2021:0989RHSA-2021:0990RHSA-2021:0991RHSA-2021:0992RHSA-2021:0993RHSA-2021:0994RHSA-2021:0995RHSA-2021:0996SUSE-SU-2021:0966-1SUSE-SU-2021:0999-1SUSE-SU-2021:1007-1SUSE-SU-2021:1167-1SUSE-SU-2021:14684-1USN-4893-1USN-4995-1USN-4995-2
Timeline
- 31-03-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
A texture upload of a Pixel Buffer Object could have confused the WebGL code to skip binding the buffer used to unpack it, resulting in memory corruption and a potentially exploitable information leak or crash. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.
CVSS metrics
4 scores · 3 sources · 2 versionsHigh 8.1Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
- OSV · DebianEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Medium 5.8Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:N/A:PSourcesSingle source
EPSS trend
Probability
1.15%
Chance of exploitation in the next 30 days
Percentile
66%
Versus all other CVEs
30-day change
0.00 pp
From 1.15% on 19-09-2026
19-09-202619-10-2026
EPSS score1.15%
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< 87.0+build3-0ubuntu0.16.04.2 | < 87.0+build3-0ubuntu0.18.04.2 | < 87.0+build3-0ubuntu0.20.04.2
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
- mozjs78All versions (No fix recorded)
Mozilla3 products
- firefox≥ unspecified, < 87 | < 87.0
- firefox_esr≥ unspecified, < 78.9 | < 78.9
- thunderbird≥ unspecified, < 78.9 | < 78.9
Debian2 products
- firefox-esr< 78.9.0esr-1
- thunderbird< 1:78.9.0-1
3 vendors · 11 products
