CVE-2025-34079Public exploitNetwork attack vector

SYSTEM code execution via ExternalScripts API

Published Jul 2, 2025 · Updated Apr 7, 2026

Code injection in NSClient++ 0.5.2.35 allows remote authenticated users to execute commands as SYSTEM through its web interface. The /settings/query.json API accepts an administrator-supplied command as an external script, persists it, and /query/{name} runs it. Exploitation requires the administrator password and enabled web interface and ExternalScripts module, resulting in full control of the Windows host.

CVSS severity7.8
High
EPSS probability1.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in NSClient++ 0.5.2.35 allows remote authenticated users to execute commands as SYSTEM through its web interface. The /settings/query.json API accepts an administrator-supplied command as an external script, persists it, and /query/{name} runs it. Exploitation requires the administrator password and enabled web interface and ExternalScripts module, resulting in full control of the Windows host.

The record

CVE
CVE-2025-34079
Published
Jul 2, 2025
Updated
Apr 7, 2026
Vendor
NSClient++
Product
NSClient++
Classifications
CWE-94, T1059.003
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 2, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.5.2.35

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

NSClient++ · NSClient++version=0.5.2.35

Published CVSS scores

7.5GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.003Windows Command Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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