CVE-2025-34079

02.07.2025, 20:15

An authenticated remote code execution vulnerability exists in NSClient++ version 0.5.2.35 when the web interface and ExternalScripts module are enabled. A remote attacker with the administrator password can authenticate to the web interface (default port 8443), inject arbitrary commands as external scripts via the /settings/query.json API, save the configuration, and trigger the script via the /query/{name} endpoint. The injected commands are executed with SYSTEM privileges, enabling full remote compromise.

This capability is an intended feature, but the lack of safeguards or privilege separation makes it risky when exposed to untrusted actors.

Code Injection

Provider	Type	Base Score	Vector
NIST	NIST	UNKNOWN	---
VulnCheck	CNA	---	---
CISA-ADP	ADP	---	---

Awaiting analysis

This vulnerability is currently awaiting analysis.

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Common Weakness Enumeration

CWE-94 - Improper Control of Generation of Code ('Code Injection')
The software constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

References

https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/http/nscp_authenticated_rce.rb

https://vulncheck.com/advisories/nsclient-localtoremote-system-compromise

https://www.exploit-db.com/exploits/48360