CVE-2025-66265 Insecure permissions in configuration directory (C:\\usr)
Insecure permissions in the C:\usr directory allow authenticated users to modify configuration files or hijack DLLs, leading to privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-66265?
CVE-2025-66265 is a medium-severity vulnerability in MegaTec Taiwan ClientMate, published on 26 Nov 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
CMService.exe creates the C:\\usr directory and subdirectories with insecure permissions, granting write access to all authenticated users. This allows attackers to replace configuration files (such as snmp.conf) or hijack DLLs to escalate privileges.
Weakness: CWE-269
Which versions are affected by CVE-2025-66265?
How do I fix CVE-2025-66265?
No fix has been published for CVE-2025-66265 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-66265 being exploited?
There is no known exploitation of CVE-2025-66265 in the wild and no public exploit code.
Sources
Also known as GHSA-9cqc-hhcp-cf94.