CVE-2025-9181
MEDIUMCVSS 6.5/10EPSS 0.34%
Last modified
CVE-2025-9181 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Uninitialized memory in the JavaScript Engine component. This vulnerability was fixed in Firefox 142, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2.. EPSS estimates a 0.34% chance of exploitation in the next 30 days.
Description
Uninitialized memory in the JavaScript Engine component. This vulnerability was fixed in Firefox 142, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 128.14.0 |
| Mozilla | Firefox | < 142.0 |
| Mozilla | Firefox | >= 140.0, < 140.2.0 |
| Mozilla | Thunderbird | < 128.14.0 |
| Mozilla | Thunderbird | < 142.0 |
| Mozilla | Thunderbird | >= 140.0, < 140.2.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1977130Issue Tracking, Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2025-64/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-66/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-67/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-70/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-71/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-72/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2025-9181?
Uninitialized memory in the JavaScript Engine component. This vulnerability was fixed in Firefox 142, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2.
How severe is CVE-2025-9181?
CVE-2025-9181 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.
How do I fix CVE-2025-9181?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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Are you affected by CVE-2025-9181?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST