CVE-2025-9181
Medium
Published: 19 August 2025
Published
19 August 2025
Modified
13 April 2026
KEV Added
—
Patch
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CVSS Score v3.1
6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
EPSS Score
0.0012
31.2th percentile
Risk Priority
13
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2025-9181 is a medium-severity Use of Uninitialized Variable (CWE-457) vulnerability in Mozilla Firefox. Its CVSS base score is 6.5 (Medium).
Operationally, ranked at the 31.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-25244
Vulnerability details
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.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
mozilla
firefox
≤ 128.14.0 · ≤ 142.0 · 140.0 — 140.2.0
mozilla
thunderbird
≤ 128.14.0 · ≤ 142.0 · 140.0 — 140.2.0
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.