CVE-2024-55956
Cleo Multiple Products Unauthenticated File Upload Vulnerability
- Critical 9.8
- Exploited: added to CISA KEV 17 Dec 2024
- Used in ransomware campaigns
Description
In Cleo Harmony before 5.8.0.24, VLTrader before 5.8.0.24, and LexiCom before 5.8.0.24, an unauthenticated user can import and execute arbitrary Bash or PowerShell commands on the host system by leveraging the default settings of the Autorun directory.
Key facts
- Published
- 13 Dec 2024
- Last changed
- 5 Aug 2026
- Assigned by
- mitre
- KEV added
- 17 Dec 2024
- KEV fix due
- 7 Jan 2025
- Used in ransomware
- Yes, according to CISA
- EPSS
- 93.968% likely to be exploited in the next 30 days, higher than 99.848% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 9.8CVSS 3.1, Criticalfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
What to do
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a |
|
Timeline
- 13 Dec 2024 Published
- 17 Dec 2024 CVE-2024-55956 added to CISA KEV
- 17 Dec 2024 Added to the CISA KEV catalogue