CVE-2024-55956
Published: December 17, 2024
Official Description
Cleo Harmony, VLTrader, and LexiCom, which are managed file transfer products, contain an unrestricted file upload vulnerability that could allow an unauthenticated user to import and execute arbitrary bash or PowerShell commands on the host system by leveraging the default settings of the Autorun directory.
CISA KEV Advisory
Cleo Multiple Products Unauthenticated File Upload Vulnerability
Cleo Harmony, VLTrader, and LexiCom, which are managed file transfer products, contain an unrestricted file upload vulnerability that could allow an unauthenticated user to import and execute arbitrary bash or PowerShell commands on the host system by leveraging the default settings of the Autorun directory.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Risk Analysis
Cleo Harmony, VLTrader, and LexiCom, which are managed file transfer products, contain an unrestricted file upload vulnerability. This flaw allows an unauthenticated user to import and execute arbitrary bash or PowerShell commands on the host system. The high EPSS score of 0.89138 indicates a very high likelihood of exploitation, and its presence in CISA's KEV confirms it has been actively exploited.
This vulnerability is actively being exploited in the wild. Unauthenticated attackers can remotely execute commands by leveraging default settings.
Review and apply any available patches or updates for Cleo Harmony, VLTrader, and LexiCom. Ensure the Autorun directory is properly secured and restrict file upload capabilities to trusted users.
Technical Analysis
CVE-2024-55956 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2024-55956 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Exploit & PoC Resources
All References (2)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2024-55956 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1