CVE-2025-1011: Mozilla Firefox · Code Injection
Affects Mozilla FirefoxSource CVE Database V5
Not known to be exploited · CVSS 9.8 Critical : upgrade to 135 as a priority.
Data as of 25 Oct 2026, 19:02 UTC
- EPSS
- 0.6% chance of exploitation in 30 days – higher than 50% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 135
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 4 Feb 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 135.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Mozilla Firefox | Affected
| Fixed in
|
AI-suggested
Mozilla has released official fixes for this vulnerability in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135. Users and administrators should update to these versions or later to remediate the vulnerability. Since this is not a cloud service, patching the client software is required. Patch status is confirmed by the vendor advisory.
Description
A bug in WebAssembly code generation could have lead to a crash. It may have been possible for an attacker to leverage this to achieve code execution. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.
References
- bugzilla.mozilla.org/show_bug.cgi?id=1936454 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-07/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-09/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-10/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-11/ (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/02/msg00006.html (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/02/msg00005.html (opens in a new tab)