Authenticated Remote Code Execution Vulnerability in NSClient++ by NSClient
CVE-2025-34079

7.5HIGH

Key Information:

Vendor

Nsclient++

Status
Nsclient++
Vendor
CVE Published:
2 July 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-34079?

An authenticated remote code execution vulnerability exists in NSClient++ version 0.5.2.35 when the web interface and ExternalScripts module are enabled. This vulnerability can be exploited by a remote attacker who possesses the administrator password and can authenticate to the web interface (default port 8443). Through the /settings/query.json API, the attacker can inject arbitrary commands to be executed as external scripts and then save the configuration. The scripts can subsequently be triggered via the /query/{name} endpoint, executing the injected commands with SYSTEM privileges. While this feature is designed to allow script execution, the absence of proper safeguards and privilege separation renders it highly risky if exposed to untrusted entities.

Affected Version(s)

NSClient++ Windows 0.5.2.35

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-34079 - Proof of Concept

References

https://raw.githubusercontent.com/rapid7/metasploit-frame...
exploit
https://www.exploit-db.com/exploits/48360
exploit
https://vulncheck.com/advisories/nsclient-localtoremote-s...
third-party-advisory

CVSS V4

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

kindredsec
Yann Castel
.