#VU108044 Improper locking in Mozilla Firefox and Firefox ESR - CVE-2025-2817
Published: April 29, 2025 / Updated: April 29, 2025
Vulnerability identifier: #VU108044
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-2817
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Mozilla Firefox
Firefox ESR
Mozilla Firefox
Firefox ESR
Software vendor:
Mozilla
Mozilla
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to improper locking mechanism in Firefox Updater. A medium-integrity user process can interfere with the SYSTEM-level updater by manipulating the file-locking behavior by injecting code into the user-privileged process. A local user or malicious software installed on the system can bypass intended access controls, allowing SYSTEM-level file operations on paths controlled by a non-privileged user and enabling privilege escalation.
Remediation
Install updates from vendor's website.