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Fencer Vulns
critical 9.8

CVE-2024-55956 kev+ ransomware in the critical feed json

In Cleo Harmony before 5.8.0.24, VLTrader before 5.8.0.24, and LexiCom before 5.8.0.24, an unauthenticated user can import and execute arbi…

published 2024-12-13 22 mo ago modified 2026-08-05 3 mo ago also EUVD-2024-52864

cvss
9.8
version 3.1, CNA
cisa kev
Exploited
added 2024-12-17, used in ransomware
epss
94.0%
EPSS 94.0% chance of exploitation in 30 days, percentile 99.8%
public exploits
1
Metasploit, plus a Nuclei check

Summary

In Cleo Harmony before 5.8.0.24, VLTrader before 5.8.0.24, and LexiCom before 5.8.0.24, an unauthenticated user can import and execute arbitrary Bash or PowerShell commands on the host system by leveraging the default settings of the Autorun directory.

Patch / fix

cisa required action Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

  • cleo harmony 5.8.0.24
  • cleo lexicom 5.8.0.24
  • cleo vltrader 5.8.0.24

Timeline

  1. First public exploit (Metasploit exploit/multi/http/cleo_rce_cve_2024_55956)
  2. Published
  3. CISA SSVC: exploitation active
  4. Added to CISA KEV
  5. CISA patch deadline

Known exploited

Added
22 mo ago
Patch by
2025-01-07 (22 mo ago)
Ransomware
Known to be used in ransomware campaigns
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Vendor, product
Cleo, Multiple Products
CISA name
Cleo Multiple Products Unauthenticated File Upload Vulnerability

Ransomware

Groups reported to have exploited it in intrusions.

  • Clop ransomware gang

reported by huntress.com

Ransomware Vulnerability Matrix by BushidoUK (github.com/BushidoUK/Ransomware-Vulnerability-Matrix), reformatted per CVE. CC BY 4.0

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
22 mo ago

Exploit prediction

93.97% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Metasploit exploit/multi/http/cleo_rce_cve_2024_55956 Cleo LexiCom, VLTrader, and Harmony Unauthenticated Remote Code Execution metasploit exploit, excellent rank, 2024-12-09
  • Nuclei template Cleo Harmony < 5.8.0.24 - File Upload Vulnerability nuclei detection template
  • huntress.com https://www.huntress.com/blog/threat-advisory-oh-no-cleo-cleo-software-actively-being-exploited-in-the-wild referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Classification

Weakness
  • CWE-77 Improper Neutralization of Special Elements used in a Command

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.