CVE-2025-1933

HIGH

Firefox <115.21.0, 115.21-115.*, <136.0, >=136; Thunderbird <128.8, >=128.8-128.*, >=136 Type Confusion

Title source: llm
STIX 2.1

Description

On 64-bit CPUs, when the JIT compiles WASM i32 return values they can pick up bits from left over memory. This can potentially cause them to be treated as a different type. This vulnerability was fixed in Firefox 136, Firefox ESR 115.21, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.

References (7)

Core 7

Scores

CVSS v3 7.6
EPSS 0.0049
EPSS Percentile 65.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

Status published
Products (8)
mozilla/firefox < 115.21.0
mozilla/firefox < 136.0
Mozilla/Firefox 115.21 - 115.*
Mozilla/Firefox 128.8 - 128.*
Mozilla/Firefox 136
mozilla/thunderbird < 128.8
Mozilla/Thunderbird 128.8 - 128.*
Mozilla/Thunderbird 136
Published Mar 04, 2025
Tracked Since Feb 18, 2026