CVE-2025-34079: Nsclient Nsclient++ remote code execution (CVSS 7.8)

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.

CVSS 3.1 breakdown

Attack vectorLocal

Attack complexityLow

Privileges requiredLow

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Nsclient Nsclient++0.5.2.35

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/http/nscp_authenticated_rce.rbExploit
https://vulncheck.com/advisories/nsclient-localtoremote-system-compromiseExploitThird Party Advisory
https://www.exploit-db.com/exploits/48360ExploitVDB Entry

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2025-34079 being actively exploited?

CVE-2025-34079 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.70%.

How severe is CVE-2025-34079?

CVE-2025-34079 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 1.70% probability of exploitation.

Which products are affected by CVE-2025-34079?

Affected products include Nsclient Nsclient++.

How do I fix CVE-2025-34079?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-34079 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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