CVE-2021-30461

CRITICAL EXPLOITED NUCLEI

VoIPmonitor < 24.61 - Unauthenticated Remote Code Execution via SPOOLDIR Injection

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2021-30461 has been observed exploited in the wild (reported by VulnCheck KEV). EIP tracks 4 public exploits from researchers including Al1ex, Vulnmachines, daedalus. A Nuclei detection template is also available.

AI-analyzed exploit summary This repository contains a functional exploit for CVE-2021-30461, an unauthenticated remote code execution vulnerability in VoIPmonitor. The exploit leverages improper input validation in the SPOOLDIR parameter to execute arbitrary commands and upload a PHP web shell.

Description

A remote code execution issue was discovered in the web UI of VoIPmonitor before 24.61. When the recheck option is used, the user-supplied SPOOLDIR value (which might contain PHP code) is injected into config/configuration.php.

Exploits (4)

nomisec WORKING POC 12 stars
by Al1ex · remote
https://github.com/Al1ex/CVE-2021-30461

This repository contains a functional exploit for CVE-2021-30461, an unauthenticated remote code execution vulnerability in VoIPmonitor. The exploit leverages improper input validation in the SPOOLDIR parameter to execute arbitrary commands and upload a PHP web shell.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Trivial
Reliability
Reliable
Target: VoIPmonitor < 24.60
No auth needed
Prerequisites: Network access to the target VoIPmonitor instance · Python 3 with requests library
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec WORKING POC 2 stars
by Vulnmachines · remote
https://github.com/Vulnmachines/CVE-2021-30461

This repository contains a functional exploit for CVE-2021-30461, an unauthenticated remote code execution vulnerability in VoIP Monitor. The exploit leverages command injection via the SPOOLDIR parameter to execute arbitrary commands and upload a PHP web shell.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Trivial
Reliability
Reliable
Target: VoIP Monitor (all versions)
No auth needed
Prerequisites: Network access to the target VoIP Monitor instance · Python 3 with requests library
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec WORKING POC
by daedalus · remote
https://github.com/daedalus/CVE-2021-30461

This Python script exploits CVE-2021-30461, an unauthenticated remote code execution vulnerability in VoIPmonitor. It crafts a malicious HTTP POST request with a payload that injects a system command via the SPOOLDIR parameter, demonstrating RCE.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Trivial
Reliability
Reliable
Target: VoIPmonitor (version not specified)
No auth needed
Prerequisites: Network access to the target VoIPmonitor instance · Target must be running a vulnerable version of VoIPmonitor
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec WORKING POC
by puckiestyle · remote
https://github.com/puckiestyle/CVE-2021-30461

This repository contains a functional exploit for CVE-2021-30461, an unauthenticated remote code execution vulnerability in VoIPmonitor. The exploit leverages command injection via the SPOOLDIR parameter to upload a PHP shell and execute arbitrary commands.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Trivial
Reliability
Reliable
Target: VoIPmonitor < 24.60
No auth needed
Prerequisites: Network access to the target VoIPmonitor instance · Python 3 with the requests library
devstral-2 · analyzed Feb 18, 2026 Full analysis →

Nuclei Templates (1)

VoipMonitor <24.61 - Remote Code Execution
CRITICALby shifacyclewala,hackergautam
Shodan: http.title:"VoIPmonitor" || http.title:"voipmonitor"
FOFA: title="voipmonitor"

References (1)

Core 1
Core References
Exploit, Third Party Advisory x_refsource_misc
https://ssd-disclosure.com/ssd-advisory--voipmonitor-unauth-rce

Scores

CVSS v3 9.8
EPSS 0.3663
EPSS Percentile 98.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

VulnCheck KEV 2024-09-06
CWE
CWE-94
Status published
Products (1)
voipmonitor/voipmonitor < 24.61
Published May 29, 2021
Tracked Since Feb 18, 2026