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CVE-2024-55956

Published: Dec 13, 2024Updated: Nov 4, 2025 Sources: CVE List NVD BDUCWE-77
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
93.8%
Top 0.2%
CISA KEV
Active Exploitation
Since Dec 17, 2024
Exploits
1 Known
Remediation
Patch Available
Am I actually vulnerable?1 Nuclei template available — see how to check your systems. How to verify

Description

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-77

Affected Products

n/an/a
Cleo HarmonyCleo
Mixed
Enterprise Software / document-mgmt
VLTraderCleo
Mixed
Enterprise Software / document-mgmt
LexiComCleo
Mixed
Enterprise Software / document-mgmt
harmonycleo
Mixed
Enterprise Software / document-mgmt
cleocommercialEnterprise Softwareaka lexicom, cleo harmony, harmony
and 2 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Dec 17, 2024
Remediation due:Jan 7, 2025
Ransomware:Known ransomware use

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

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://support.cleo.com/hc/en-us/articles/28408134019735-Cleo-Product-Security-Advisory-CVE-Pending
support.cleo.com
https://support.cleo.com/hc/en-us/articles/28408134019735-Cleo-Product-Security-Update-CVE-2024-55956
support.cleo.com
https://www.security-database.com/detail.php?alert=CVE-2024-55956
security-database.com
and 4 more references View all →

Timeline

Published
Dec 13, 2024
Added to CISA KEV
Dec 17, 2024
Last Updated
Nov 4, 2025

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