CVE-2025-9181CWE-457

CVE-2025-9181

Medium · published August 20, 2025

CVSS v3.1

6.5

EPSS

Percentile

31.8

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 6.5 · MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CVSS v4.0: Not supplied
EPSS: 0.00389 · 31.8th percentile
Weakness: CWE-457 · Use of Uninitialized Variable
Published: 2025-08-20T01:15Z

Affected products (6)

Product	Versions	Fixed in
mozilla/firefox	< 128.14.0	128.14.0
mozilla/firefox	< 142.0	142.0
mozilla/firefox	≥ 140.0, < 140.2.0	140.2.0
mozilla/thunderbird	< 128.14.0	128.14.0
mozilla/thunderbird	< 142.0	142.0
mozilla/thunderbird	≥ 140.0, < 140.2.0	140.2.0

References (9)

https://bugzilla.mozilla.org/show_bug.cgi?id=1977130 · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-64/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-66/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-67/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-70/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-71/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-72/ · [email protected]https://lists.debian.org/debian-lts-announce/2025/08/msg00016.html · af854a3a-2127-422b-91ae-364da2661108 https://lists.debian.org/debian-lts-announce/2025/08/msg00018.html · af854a3a-2127-422b-91ae-364da2661108

EPSS history

Timeline

19 AUG 20:33Z
Uninitialized memory in the JavaScript Engine component
cvelistv5