Is CVE-2024-50623 in the CISA KEV catalog?

Yes. CVE-2024-50623 is on the CISA Known Exploited Vulnerabilities list, added 2024-12-13, and has known ransomware campaign use.

What is the CVSS severity of CVE-2024-50623?

CVE-2024-50623 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2024-50623?

CVE-2024-50623 has an EPSS score of 98.53% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2024-50623?

Upgrade harmony to 5.8.0.21 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2024-50623

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

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.

CWE-434Unrestricted File Upload

How to fix

Remediation Available

harmonyNVD

Affected:< 5.8.0.21Fixed in:5.8.0.21CVE-2024-50623derived from NVD

lexicomNVD

Affected:< 5.8.0.21Fixed in:5.8.0.21CVE-2024-50623derived from NVD

vltraderNVD

Affected:< 5.8.0.21Fixed in:5.8.0.21CVE-2024-50623derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

98.53%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Cleo Multiple Products Unrestricted File Upload Vulnerability

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.

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Remediation due: 2025-01-03

Associated with ransomware campaigns

References

Vendor Advisory1

support.cleo.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-434 (Unrestricted File Upload) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-12617	High	8.1	100%	KEV	Fix
CVE-2018-15961	Critical	9.8	100%	KEV	-
CVE-2021-31207	Medium	6.6	100%	KEV + Ransom	Fix
CVE-2017-12615	High	8.1	100%	KEV + Ransom	-
CVE-2025-31324	Critical	10.0	99%	KEV + Ransom	-
CVE-2016-3088	Critical	9.8	99%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-05.