CVE-2024-55956
Actively exploited. CVE-2024-55956 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-12-17) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2024-55956 is indexed in Metasploit and Nuclei. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
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.
CSIRTS triage
- What
- The vulnerability allows an unauthenticated user to import and execute arbitrary bash or PowerShell commands on the host system.
- Who is affected
- Users of Cleo Harmony, VLTrader, and LexiCom products are affected.
- Urgency
- Immediate remediation is necessary as the vulnerability is actively exploited and classified as critical.
- Action
- Apply the latest security patches provided by Cleo.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 100% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2024-55956 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- MetasploitA Metasploit Framework module targets this CVE — weaponized, point-and-click exploitation.look it up ↗
- NucleiA nuclei-templates detection/PoC template exists for this CVE.look it up ↗
Advisory coverage (1)
- criticalexploitedCVE-2024-55956: Cleo Multiple Products Unauthenticated File Upload Vulnerabilitycisa-kev · 2024-12-17
External references
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[](https://www.csirts.com/cve/CVE-2024-55956)