CVE-2025-66265

Local privilege escalation via writable service directory

Published Nov 26, 2025 · Updated Nov 26, 2025

Privilege escalation in Mega System Technologies ClientMate 6.2.2 allows local users to gain elevated privileges through writable files. CMService.exe creates C:\usr and its subdirectories with permissions that let authenticated users replace snmp.conf or plant DLLs loaded by privileged code. Existing local access is required, and successful replacement permits configuration tampering or execution in the service's elevated context.

CVSS severity6.9
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Privilege escalation in Mega System Technologies ClientMate 6.2.2 allows local users to gain elevated privileges through writable files. CMService.exe creates C:\usr and its subdirectories with permissions that let authenticated users replace snmp.conf or plant DLLs loaded by privileged code. Existing local access is required, and successful replacement permits configuration tampering or execution in the service's elevated context.

The record

CVE
CVE-2025-66265
Published
Nov 26, 2025
Updated
Nov 26, 2025
Vendor
Mega System Technologies Inc.
Product
ClientMate
Classifications
CWE-269, T1574.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 26, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.2.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Mega System Technologies Inc. · ClientMateversion=6.2.2

Published CVSS scores

6.9GridwareCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:L/SI:L/SA:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
T1574.001DLL Search Order Hijacking

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo