CVE-2024-50623
CriticalExploitedPublic exploitIn Cleo Harmony before 5.8.0.21, VLTrader before 5.8.0.21, and LexiCom before 5.8.0.21, there is an unrestricted file upload and download that could lead to remote code execution.
Published Oct 27, 2024 · Updated Oct 8, 2026
Key Facts
Patch immediately- CVE-2024-50623 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Harmony (Cleo), Lexicom (Cleo), Vltrader (Cleo).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 9, 2024 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 99% probability of exploitation in the next 30 days.
- Fixed versions are available, including Harmony 5.8.0.21, Lexicom 5.8.0.21, Vltrader 5.8.0.21.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
99%
Higher than 99.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2024-50623 brief as a PDF
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Description
In Cleo Harmony before 5.8.0.21, VLTrader before 5.8.0.21, and LexiCom before 5.8.0.21, there is an unrestricted file upload and download that could lead to remote code execution.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Dec 13, 2024 | Jan 3, 2025 | Known |
| Industry KEV feed | Dec 9, 2024 | Jan 3, 2025 | Known |
| CIRCL KEV | Dec 13, 2024 | Jan 3, 2025 | Known |
| ENISA EUVD | Dec 13, 2024 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| HarmonyCleo | See advisory | 5.8.0.21 |
| LexicomCleo | See advisory | 5.8.0.21 |
| VltraderCleo | See advisory | 5.8.0.21 |
Patched Releases
Harmony
5.8.0.21
Lexicom
5.8.0.21
Vltrader
5.8.0.21
Timeline
Publicly disclosed
Oct 27, 2024
Added to Industry KEV feed
Dec 9, 2024
Added to CISA KEV
Dec 13, 2024
Added to CIRCL KEV
Dec 13, 2024
Added to ENISA EUVD
Dec 13, 2024
Last updated
Oct 8, 2026
Weakness Type
- CWE-434 Unrestricted Upload of File with Dangerous Type
References
- advisoryhttps://support.cleo.com/hc/en-us/articles/27140294267799-Cleo-Product-Security-Advisory
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitMSF cleo_rce_cve_2024_55956.rb
- exploitVulnCheck exploitation report
FAQ
Common Questions.
In Cleo Harmony before 5.8.0.21, VLTrader before 5.8.0.21, and LexiCom before 5.8.0.21, there is an unrestricted file upload and download that could lead to remote code execution.
Affected: Harmony (Cleo); Lexicom (Cleo); Vltrader (Cleo). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 9, 2024 and is known to be used in ransomware campaigns.
Yes. It was added on Dec 13, 2024 with a federal remediation due date of Jan 3, 2025.
Public exploit code is available.
Fixed versions are available, including Harmony 5.8.0.21, Lexicom 5.8.0.21, Vltrader 5.8.0.21.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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