RCE in Nsclient Nsclient\+\+
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. 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.
Vulnerability class: RCE (Remote Code Execution)
EPSS: 0.013 (67.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Nsclient Nsclient\+\+ — versions 0.5.2.35
- Nsclient++ — versions 0.5.2.35
Weakness classification (CWE)
Public proof-of-concept exploits
References
- disclosure@vulncheck.com (Exploit, exploit)
- disclosure@vulncheck.com (Exploit, VDB Entry, exploit)
- disclosure@vulncheck.com (Exploit, Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2025-34079?
- CVE-2025-34079 is a high-severity vulnerability in Nsclient Nsclient\+\+, classified under Code Injection. CVSS score: 7.8/10. Published 2025-07-02.
- How severe is CVE-2025-34079?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2025-34079 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.