CVE-2025-9187

CRITICAL

Firefox < 142.0 and Thunderbird < 142.0 - Memory Corruption

Title source: llm
STIX 2.1

Description

Memory safety bugs present in Firefox 141 and Thunderbird 141. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 142 and Thunderbird 142.

References (3)

Core 3

Scores

CVSS v3 9.8
EPSS 0.0011
EPSS Percentile 28.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-119
Status published
Products (4)
mozilla/firefox < 142.0
Mozilla/Firefox 142
mozilla/thunderbird < 142.0
Mozilla/Thunderbird 142
Published Aug 19, 2025
Tracked Since Feb 18, 2026