CVE-2025-9187: mozilla firefox
CVSS: 9.8v3.1CriticalModified
AliasesSUSE-SU-2025:3759-1SUSE-SU-2025:3760-1SUSE-SU-2025:3804-1UBUNTU-CVE-2025-9187CGA-49qf-7xp5-4f5jCGA-hp94-v85h-qmc3
Published 19-08-2025Last modified 13-04-2026
Vulnerability summary
CVE-2025-9187 is a critical (CVSS 9.8) vulnerability in mozilla firefox. EPSS estimates a 0.49% chance of exploitation in the next 30 days, higher than 40.7% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)EPSS score
0.49%
0%100%
Low · +0.04 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 4 · Related 5Timeline
- 19-08-2025PublishedVulnerability first disclosed.
- 13-04-2026Last modifiedVulnerability information updated.
Description
Memory safety bugs present in Firefox 141 and Thunderbird 141. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 142 and Thunderbird 142.
CVSS metrics
3 scores · 3 sources · 1 versionCritical 9.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.49%
Chance of exploitation in the next 30 days
Percentile
41%
Versus all other CVEs
30-day change
+0.04 pp
From 0.45% on 21-09-2026
21-09-202621-10-2026
EPSS score0.49%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Suse23 products
- mozilla-nss&distro=SUSE Enterprise Storage 7.1< 3.112.2-150000.3.132.1
- mozilla-nss&distro=SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS< 3.112.2-150000.3.132.1
- mozilla-nss&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS< 3.112.2-150400.3.60.1
- mozilla-nss&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS< 3.112.2-150400.3.60.1
- mozilla-nss&distro=SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS< 3.112.2-150400.3.60.1
Ubuntu7 products
- mozjs102All versions (No fix recorded)
- mozjs115All versions (No fix recorded)
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
Mozilla2 products
- firefox< 142.0
- thunderbird< 142.0
Chainguard1 product
- firefox< 142-r0
Opensuse1 product
- mozilla-nss&distro=openSUSE Leap 15.6< 3.112.2-150400.3.60.1
Wolfi1 product
- firefox< 142-r0
6 vendors · 35 products