CVE-2025-9182: Mozilla Firefox · Vulnerability
Affects Mozilla FirefoxSource CVE Database V5
Not known to be exploited · CVSS 7.5 High : upgrade to 142 soon.
Data as of 25 Oct 2026, 19:02 UTC
- EPSS
- 0.4% chance of exploitation in 30 days – higher than 35% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 142
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitation evidence
Disclosed: evidence found.
CVE published 19 Aug 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.
What to do
Upgrade Mozilla Firefox to 142.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Mozilla Firefox | Affected
| Fixed in
|
AI-suggested
A fix for this vulnerability is available and has been incorporated in Firefox 142 and Firefox ESR 140.2. Users and administrators should update to these versions or later to remediate this issue. No additional mitigation steps are required as the vulnerability is addressed by the official vendor patch.
Description
Denial-of-service due to out-of-memory in the Graphics: WebRender component. This vulnerability was fixed in Firefox 142, Firefox ESR 140.2, Thunderbird 142, and Thunderbird 140.2.
References
- bugzilla.mozilla.org/show_bug.cgi?id=1975837 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-64/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-67/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-70/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-72/ (opens in a new tab)