CVE-2021-23995: mozilla firefox
CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2021-23995DEBIAN-CVE-2021-23995
Published 24-06-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-23995 is a high (CVSS 8.8) vulnerability in mozilla firefox. EPSS estimates a 1.18% chance of exploitation in the next 30 days, higher than 67.2% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (NVD)EPSS score
1.18%
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
When Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.
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 5.1Preferred score · NVD (NIST)
AV:N/AC:H/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
1.18%
Chance of exploitation in the next 30 days
Percentile
67%
Versus all other CVEs
30-day change
0.00 pp
From 1.18% on 19-09-2026
19-09-202619-10-2026
EPSS score1.18%
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
13 links- bugzilla.mozilla.org/show_bug.cgi?id=1699835X Refsource MISCIssue TrackingPermissions RequiredVendor Advisory
