CVE-2025-34079: An authenticated remote code execution vulnerability exists in NSClient++ version 0.5.2.35 when the web interf

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HIGH 7.8DOWNGRADE

CVE-2025-34079 is a high-severity flaw (CVSS 7.8) affecting nsclient\+\+. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 ex

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-94, CWE-306
Published	2025-07-02
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: nsclient

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-07-02 20:15 UTCPublished CVE record published
2026-06-17 09:13 UTCUpdated Record last modified

nsclient nsclient\+\+ DOWNGRADE

Affected: 0.5.2.35

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.5.2.35

1. Check installed version

apt-cache policy nsclient++ || rpm -q nsclient++ || nsclient++ --version

2. No fixed release: DOWNGRADE to a release before 0.5.2.35 (Debian / Ubuntu)

apt-cache madison nsclient++ sudo apt install nsclient++=<VERSION_BEFORE_0.5.2.35> sudo apt-mark hold nsclient++

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list nsclient++ sudo dnf downgrade nsclient++-<VERSION_BEFORE_0.5.2.35> sudo dnf versionlock add nsclient++

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Metasploit: NSClient++ 0.5.2.35 - ExternalScripts Authenticated Remote Code Execution

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-34079?

nsclient\+\+: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-34079 being exploited?

CVE-2025-34079 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-34079 affect?

CVE-2025-34079 affects nsclient\+\+. Severity is high (CVSS 7.8). 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 interfac

How urgent is CVE-2025-34079?

Priority 52/100. High severity; Public exploit reference

Related CVEs

CVE-2025-34078 HIGH 7.8 DOWNGRADE A local privilege escalation vulnerability exists in NSClient++ 0.5.2.35 when both the web interface and Exter

References

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