CVE-2024-50623

CRITICAL KEV RANSOMWARE NUCLEI

Cleo Harmony, VLTrader, and LexiCom < 5.8.0.21 - Unrestricted File Upload and Remote Code Execution

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2024-50623 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added December 13, 2024, with confirmed use in ransomware campaigns. EIP tracks 5 public exploits from researchers including iSee857, watchtowrlabs, verylazytech. A Nuclei detection template is also available.

AI-analyzed exploit summary The repository contains functional exploit code for CVE-2024-50623, demonstrating command execution via a session-based shell endpoint. The script includes multi-threaded scanning capabilities and validates vulnerability by checking for 'uid=' and 'gid=' in the response.

Description

In Cleo Harmony before 5.8.0.21, VLTrader before 5.8.0.21, and LexiCom before 5.8.0.21, there is an unrestricted file upload and download that could lead to remote code execution.

Exploits (5)

github WORKING POC 40 stars
by iSee857 · pythonpoc
https://github.com/iSee857/CVE-PoC/tree/main/CVE-2024-50623.py

The repository contains functional exploit code for CVE-2024-50623, demonstrating command execution via a session-based shell endpoint. The script includes multi-threaded scanning capabilities and validates vulnerability by checking for 'uid=' and 'gid=' in the response.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: OpenCode (version not specified)
No auth needed
Prerequisites: Network access to the target · OpenCode service running with vulnerable endpoint
devstral-2 · analyzed Feb 27, 2026 Full analysis →
nomisec WORKING POC 25 stars
by watchtowrlabs · infoleak
https://github.com/watchtowrlabs/CVE-2024-50623

This PoC exploits an unrestricted file upload and download vulnerability in Cleo software (CVE-2024-50623). It allows arbitrary file read and write operations via crafted HTTP headers to the Synchronization endpoint.

Classification
Working Poc 100%
Attack Type
Info Leak | Other
Complexity
Trivial
Reliability
Reliable
Target: Cleo (version not specified)
No auth needed
Prerequisites: Network access to the target's Synchronization endpoint
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WORKING POC 8 stars
by verylazytech · remote
https://github.com/verylazytech/CVE-2024-50623

This repository contains a functional proof-of-concept exploit for CVE-2024-50623, targeting Cleo's file transfer software. The exploit leverages unrestricted file upload and download capabilities to achieve remote code execution by manipulating the Synchronization endpoint.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Cleo Harmony, Cleo VLTrader, Cleo LexiCom (versions prior to 5.8.0.21)
No auth needed
Prerequisites: Network access to the target system · Cleo software with vulnerable version
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WORKING POC 5 stars
by iSee857 · remote
https://github.com/iSee857/Cleo-CVE-2024-50623-PoC

This PoC checks for CVE-2024-50623 in Cleo LexiCom by exploiting a path traversal vulnerability to read arbitrary files and upload files. It verifies the version and attempts to read system.ini and upload a test file.

Classification
Working Poc 90%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: Cleo LexiCom versions below 5.8.0.24
No auth needed
Prerequisites: Network access to the target server · Cleo LexiCom Synchronization endpoint exposed
devstral-2 · analyzed Feb 16, 2026 Full analysis →
nomisec WORKING POC
by congdong007 · infoleak
https://github.com/congdong007/CVE-2024-50623-poc

This PoC exploits a path traversal vulnerability in the target software by manipulating the 'path' parameter in the 'Retrieve' header to read arbitrary files (e.g., '/etc/passwd'). The script sends a crafted GET request to the '/Synchronization' endpoint with malicious headers.

Classification
Working Poc 80%
Attack Type
Info Leak
Complexity
Trivial
Reliability
Reliable
Target: Unknown (likely a web application with a Synchronization endpoint)
No auth needed
Prerequisites: Network access to the target endpoint · Target endpoint must be vulnerable to path traversal
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Nuclei Templates (1)

Cleo Harmony < 5.8.0.21 - Arbitary File Read
HIGHVERIFIEDby DhiyaneshDK
Shodan: Server: Cleo

Scores

CVSS v3 9.8
EPSS 0.9401
EPSS Percentile 99.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation active
Automatable no
Technical Impact total

Details

CISA KEV 2024-12-13
VulnCheck KEV 2024-12-09
InTheWild.io 2024-12-13
ENISA EUVD EUVD-2024-45217
Ransomware Use Confirmed
CWE
CWE-434
Status published
Products (3)
cleo/harmony < 5.8.0.21
cleo/lexicom < 5.8.0.21
cleo/vltrader < 5.8.0.21
Published Oct 28, 2024
KEV Added Dec 13, 2024
Tracked Since Feb 18, 2026