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

> Authenticated attackers can execute arbitrary commands with SYSTEM privileges via the ExternalScripts API if the web interface is enabled.

- **Severity:** High 7.5 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Jul 2025
- **Updated:** 7 Apr 2026
- **Also known as:** GHSA-rhrw-79v5-jc5x

## What is CVE-2025-34079?

CVE-2025-34079 is a high-severity command injection vulnerability in NSClient++, published on 2 Jul 2025. An attacker needs administrator access to exploit it, with no action from the victim.

### Official 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.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2025-34079?

It affects 1 product.


Products: Nsclient Nsclient\+\+.

## How do I fix CVE-2025-34079?

No fix has been published for CVE-2025-34079 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-34079 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-34079 exists.

Public exploit code:

- NSClient++ 0.5.2.35 - ExternalScripts Authenticated Remote Code Execution (metasploit)

## Other vulnerabilities in NSClient++

- [CVE-2018-6384](https://insights.sbomify.com/CVE-2018-6384/): Privilege escalation in n/a (high 7.8)
- [CVE-2025-34078](https://insights.sbomify.com/CVE-2025-34078/): NSClient++ 0.5.2.35 Local Privilege Escalation via ExternalScripts and Web Interface (high 7.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-34079 and fix it if it is affected.

What it is: CVE-2025-34079 is a high-severity command injection vulnerability in NSClient++, published on 2 Jul 2025. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-34079 exists.

Affected product: NSClient++. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-34079/ (Markdown: https://insights.sbomify.com/CVE-2025-34079/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-34079
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-34079
- OSV: https://osv.dev/vulnerability/CVE-2025-34079

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-34079/
Summaries are generated and may contain mistakes; the official description above is the record.