CVE-2025-9181mediumCWE-457

CVE-2025-9181: medium-severity vulnerability in Mozilla Firefox

Uninitialized memory in the JavaScript Engine component

Published 19 Aug 2025 · Updated 13 Apr 2026

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6.5epss 0.4%

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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In the same product, most dangerous first.

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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/