CVE-2025-2817

HIGH

Firefox <115.23.0, 115.23-115.*, <128.10.0, 128.10-128.*, >=138 Privilege Escalation via Update Mechanism

Title source: llm
STIX 2.1

Description

Thunderbird's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an attacker could bypass intended access controls, allowing SYSTEM-level file operations on paths controlled by a non-privileged user and enabling privilege escalation. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.

References (7)

Core 7

Scores

CVSS v3 8.8
EPSS 0.0038
EPSS Percentile 59.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-22
Status published
Products (8)
mozilla/firefox < 115.23.0
mozilla/firefox < 138.0
Mozilla/Firefox 115.23 - 115.*
Mozilla/Firefox 128.10 - 128.*
Mozilla/Firefox 138
mozilla/thunderbird < 128.10.0
Mozilla/Thunderbird 128.10 - 128.*
Mozilla/Thunderbird 138
Published Apr 29, 2025
Tracked Since Feb 18, 2026