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VulnerabilityCVE-2024-50623Published 2024-10-27

CVE-2024-50623 — Cleo Harmony

criticalCISA KEVRansomwarePublic exploit5 PoC reposNuclei template

As of 2026-10-07, CVE-2024-50623 is a CRITICAL-severity vulnerability in Cleo Harmony, CVSS v3.1 9.8, EPSS 98.6% (99.9th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-12-13), with a US federal remediation deadline of 2025-01-03, and CISA links it to known ransomware campaigns. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2024-50623, most recently “Cl0p Ransomware MFT Attack Pattern: Multi-Year Zero-Day Campaigns Against File Transfer and Enterprise Software (2020-2025)”.

CVSS v3.1
9.8/10Critical
EPSS
98.6%Higher than 99.9% of scored CVEs
CISA KEV
ListedAdded · due 2025-01-03
Tracked threats
1Campaigns referencing it
Priority
10/10Threadlinqs triage score
Published
Updated 2026-10-07
CVSS v3.1 9.8 (CRITICAL) · EPSS 98.6% (higher than 99.9% of all scored CVEs) · Priority 10/10 · Published 2024-10-27

Last updated:

What is CVE-2024-50623?

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.

The record classifies CVE-2024-50623 under weakness class CWE-434. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 3 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 713 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST)
98.6% probability of exploitation in the next 30 days, higher than 99.9% of all scored CVEs
CISA KEV
Listed since 2024-12-13, federal remediation deadline 2025-01-03 — used in known ransomware campaigns
Threadlinqs priority
10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum
Published
2024-10-27, last modified 2026-10-07

Is CVE-2024-50623 being exploited?

CISA added CVE-2024-50623 to the Known Exploited Vulnerabilities catalog on 2024-12-13, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2025-01-03 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. Weaponised exploit code for CVE-2024-50623 is publicly available. 5 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (http/cves/2024/CVE-2024-50623.yaml). It currently carries a trending score of 50 in the Threadlinqs vulnerability feed.

Affected products and versions

  • Cleo: Harmony, Lexicom, Vltrader

How to fix CVE-2024-50623

Vendor advisory: https://support.cleo.com/hc/en-us/articles/27140294267799-Cleo-Product-Security-Advisory. Because CVE-2024-50623 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2025-01-03. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2024-50623

1 tracked threat in the Threadlinqs corpus references CVE-2024-50623, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Other references