CVE-2025-8027CWE-457

CVE-2025-8027

Medium · published July 23, 2025

CVSS v3.1
6.5
EPSS
0%
Percentile
36.4
In the wild
Unconfirmed
What it is

On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.

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
0.00432 · 36.4th percentile
Weakness
CWE-457 · Use of Uninitialized Variable
Published
2025-07-23T01:15Z
Affected products (7)
ProductVersionsFixed in
mozilla/firefox< 115.26.0115.26.0
mozilla/firefox< 141.0141.0
mozilla/firefox≥ 128.0, < 128.13.0128.13.0
mozilla/firefox≥ 140.0, < 140.1.0140.1.0
mozilla/thunderbird< 128.13.0128.13.0
mozilla/thunderbird< 141.0141.0
mozilla/thunderbird≥ 140.0, < 140.1.0140.1.0
References (9)
https://bugzilla.mozilla.org/show_bug.cgi?id=1968423 · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-56/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-57/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-58/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-59/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-61/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-62/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-63/ · [email protected]https://lists.debian.org/debian-lts-announce/2025/07/msg00016.html · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 22 JUL 20:49Z
    JavaScript engine only wrote partial return value to stack
    cvelistv5