CVE-2025-5272

HIGH

Firefox and Thunderbird < 139.0 - Out-of-bounds Write

Title source: llm
STIX 2.1

Description

Memory safety bugs present in Firefox 138 and Thunderbird 138. 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 139 and Thunderbird 139.

References (3)

Core 3

Scores

CVSS v3 7.3
EPSS 0.0037
EPSS Percentile 58.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-787
Status published
Products (4)
mozilla/firefox < 139.0
Mozilla/Firefox 139
mozilla/thunderbird < 139.0
Mozilla/Thunderbird 139
Published May 27, 2025
Tracked Since Feb 18, 2026