CVE-2024-55956
Cleo Harmony, VLTrader, and LexiCom, which are managed file transfer products, contain an unrestricted file upload vulnerability that could allow an…
Browse: All 2024 CVEs · All vendors
- CVSS score
- 9.8 Critical
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- CISA KEV
- Yes — actively exploited (added 2024-12-17, remediation due 2025-01-07)
- Ransomware
- Known ransomware campaign use
- Weakness (CWE)
- CWE-77
- Published
- 2024-12-13
- Last modified
- 2026-08-05
- NVD status
- Analyzed
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.
Affected products
- cleo harmony
- cleo lexicom
- cleo vltrader
Affected ranges per NVD CPE data; confirm exact versions in the vendor advisory.
Required action (CISA)
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Federal remediation deadline: 2025-01-07.
How to prioritize this
This vulnerability is on the CISA KEV list, meaning it is being actively exploited — treat it as urgent regardless of the raw CVSS number. Use the live CVE lookup for the latest NVD data, and the CVSS 3.1 calculator to model your own environmental score. For the actively exploited vulnerabilities that matter this week, read The Exploit HQ daily security brief.
References
- https://support.cleo.com/hc/en-us/articles/28408134019735-Cleo-Product-Security-Advisory-CVE-Pending
- https://support.cleo.com/hc/en-us/articles/28408134019735-Cleo-Product-Security-Update
- https://www.huntress.com/blog/threat-advisory-oh-no-cleo-cleo-software-actively-being-exploited-in-the-wild
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-55956
FAQ
Is CVE-2024-55956 actively exploited?
Yes. CISA added CVE-2024-55956 to its Known Exploited Vulnerabilities (KEV) catalog on 2024-12-17, with a federal remediation deadline of 2025-01-07. A KEV listing means real-world exploitation is confirmed, so patching this should be prioritized above many higher-CVSS bugs that aren't being exploited.
What is the CVSS score of CVE-2024-55956?
CVE-2024-55956 has a CVSS base score of 9.8 (Critical). Its vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Related vulnerabilities
- CVE-2024-50623 — Cleo Multiple Products
- CVE-2026-105134 — Ahsay AhsayCBS
- CVE-2026-96951 — Microsoft Windows
- CVE-2016-3081 — Apache Struts
- CVE-2026-8037 — Progress LoadMaster
- CVE-2026-42271 — BerriAI LiteLLM
Data source: NVD & CISA KEV. Shown as-is; nothing added. Last generated from NVD data — re-check the live tool for updates.
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