CVE-2025-8027

MEDIUM

Firefox < 115.26.0, 115.26-115.*, < 128.13.0, 128.13-128.*, < 140.1, >=141 - Uninitialized Variable Use in IonMonkey-JIT

Title source: llm
STIX 2.1

Description

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.

References (9)

Core 9

Scores

CVSS v3 6.5
EPSS 0.0034
EPSS Percentile 25.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-457
Status published
Products (11)
mozilla/firefox < 115.26.0
mozilla/firefox < 141.0
Mozilla/Firefox 115.26 - 115.*
Mozilla/Firefox 128.13 - 128.*
Mozilla/Firefox 140.1 - 140.*
Mozilla/Firefox 141
mozilla/thunderbird < 128.13.0
mozilla/thunderbird < 141.0
Mozilla/Thunderbird 128.13 - 128.*
Mozilla/Thunderbird 140.1 - 140.*
... and 1 more
Published Jul 22, 2025
Tracked Since Feb 18, 2026