CVE-2021-41560

CRITICAL IN THE WILD

OpenCATS <= 0.9.6 - Remote Code Execution via Executable File Upload

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2021-41560 has been observed exploited in the wild (reported by InTheWild.io). EIP tracks 1 public exploit from researchers including Nickguitar.

AI-analyzed exploit summary This repository contains a functional exploit for CVE-2021-41560, an RCE vulnerability in OpenCATS <= 0.9.4 due to improper file upload validation. The script uploads a malicious PHP file disguised as a GIF and executes commands via HTTP requests.

Description

OpenCATS through 0.9.6 allows remote attackers to execute arbitrary code by uploading an executable file via lib/FileUtility.php.

Exploits (1)

nomisec WORKING POC 11 stars
by Nickguitar · poc
https://github.com/Nickguitar/RevCAT

This repository contains a functional exploit for CVE-2021-41560, an RCE vulnerability in OpenCATS <= 0.9.4 due to improper file upload validation. The script uploads a malicious PHP file disguised as a GIF and executes commands via HTTP requests.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: OpenCATS <= 0.9.4
No auth needed
Prerequisites: Target must have OpenCATS <= 0.9.4 installed · At least one active job posting on the target instance
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (3)

Core 3
Core References
Broken Link, Third Party Advisory x_refsource_misc
https://youtu.be/isiDISag7CM
Exploit, Patch, Third Party Advisory x_refsource_misc
https://github.com/Nickguitar/RevCAT

Scores

CVSS v3 9.8
EPSS 0.1113
EPSS Percentile 95.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

InTheWild.io 2022-01-01
CWE
CWE-434
Status published
Products (1)
opencats/opencats < 0.9.6
Published Dec 15, 2021
Tracked Since Feb 18, 2026