CVE-2024-55956 — Cleo Multiple Products Unauthenticated File Upload Vulnerability
Overview
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.
Vulnerability details
- CVE ID
- CVE-2024-55956
- Vulnerability
- Cleo Multiple Products Unauthenticated File Upload Vulnerability
- Vendor
- Cleo
- Affected products
- Cleo: Multiple Products
- Severity
- HIGH
- Exploitation status
- Actively exploited in the wild (CISA KEV)
- Published
- 2024-12-17
Remediation guidance
CVE-2024-55956 is in CISA's Known Exploited Vulnerabilities (KEV) catalog — U.S. federal civilian agencies are required to remediate it under Binding Operational Directive 22-01. Treat it as a priority for every environment.
Apply the vendor's official security update for Cleo the affected product as soon as possible. Where a patch is unavailable, apply vendor mitigations or isolate/segment exposed systems.
Hunt for indicators of compromise tied to this vulnerability and confirm logging/EDR coverage on affected assets.
Authoritative references
Remediate CVE-2024-55956 — and stay ahead of the next one
CVE-2024-55956 is listed in the CISA KEV catalog as actively exploited — treat remediation as urgent. Scan your domain free to see whether CVE-2024-55956 and other Cleo issues affect you and get a prioritized remediation report (full report from ₹999) — or stream the full feed of 1,600+ actively-exploited CVEs straight into your SOC.
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