CVE-2025-9181

Uninitialized memory in the JavaScript Engine component

CVSS 6.5 MEDIUMEPSS 0.3%CWE-457

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.5EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

19 Aug 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected products

Mozilla · Firefox Mozilla · Thunderbird

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References

https://bugzilla.mozilla.org/show_bug.cgi?id=1977130 https://lists.debian.org/debian-lts-announce/2025/08/msg00016.html https://lists.debian.org/debian-lts-announce/2025/08/msg00018.html https://www.mozilla.org/security/advisories/mfsa2025-64/https://www.mozilla.org/security/advisories/mfsa2025-66/https://www.mozilla.org/security/advisories/mfsa2025-67/https://www.mozilla.org/security/advisories/mfsa2025-70/https://www.mozilla.org/security/advisories/mfsa2025-71/https://www.mozilla.org/security/advisories/mfsa2025-72/