CVE-2024-50623 Cleo Multiple Products: dangerous file upload
In plain words: The program accepts files it should refuse, such as programs disguised as ordinary uploads. The attacker can place and run their own tools on the server.
Confirmed exploited by CISA on · US federal patch deadline Jan 3, 2025
What to do
- Install Cleo's security update for Multiple Products. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- Cleo Multiple Products Unrestricted File Upload Vulnerability
- Product
- Cleo Multiple Products
- CISA description
- Cleo Harmony, VLTrader, and LexiCom, which are managed file transfer products, contain an unrestricted file upload and download vulnerability that can lead to remote code execution with elevated privileges.
- Type of flaw
- Dangerous file upload (CWE-434)
- Confirmed exploited
- Dec 13, 2024 — known to be used in ransomware attacks
- US federal patch deadline
- Jan 3, 2025
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Answering about CVE-2024-50623 ·
Questions about CVE-2024-50623
Is CVE-2024-50623 being exploited?
Yes. CISA added CVE-2024-50623 to its Known Exploited Vulnerabilities catalog on Dec 13, 2024, which means there is reliable evidence of real-world attacks, including by ransomware groups.
How do I fix CVE-2024-50623?
Install Cleo's security update for Multiple Products. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2024-50623?
Only if you use Cleo Multiple Products. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.