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CVE-2025-34079: NSClient++ Authenticated Remote Code Execution via ExternalScripts API

7.5 CVSS

Description

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.

Classification

CVE ID: CVE-2025-34079

CVSS Base Severity: HIGH

CVSS Base Score: 7.5

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Problem Types

CWE-94 Improper Control of Generation of Code ('Code Injection') CWE-306 Missing Authentication for Critical Function

Affected Products

Vendor: NSClient++

Product: NSClient++

Stakeholder-Specific Vulnerability Categorization (SSVC)

SSVC Exploitation: poc

SSVC Technical Impact: total

SSVC Automatable: false

References

https://nvd.nist.gov/vuln/detail/CVE-2025-34079
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/http/nscp_authenticated_rce.rb
https://www.exploit-db.com/exploits/48360
https://vulncheck.com/advisories/nsclient-localtoremote-system-compromise

Timeline