// For flags

CVE-2025-34079

NSClient++ Authenticated Remote Code Execution via ExternalScripts API

Severity Score

7.5
*CVSS v4

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

2
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

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.

*Credits: kindredsec, Yann Castel
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
High
User Interaction
None
System
Vulnerable | Subsequent
Confidentiality
High
None
Integrity
High
None
Availability
High
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
Single
Confidentiality
Complete
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
Poc
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2025-04-15 CVE Reserved
  • 2025-07-02 CVE Published
  • 2025-07-02 CVE Updated
  • 2025-07-02 First Exploit
  • 2025-07-03 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-94: Improper Control of Generation of Code ('Code Injection')
  • CWE-306: Missing Authentication for Critical Function
CAPEC
  • CAPEC-233: Privilege Escalation
  • CAPEC-242: Code Injection
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
NSClient++
Search vendor "NSClient++"
 NSClient++
Search vendor "NSClient++" for product "NSClient++"
 0.5.2.35
Search vendor "NSClient++" for product "NSClient++" and version "0.5.2.35"
en
Affected