CVE-2024-50623: Cleo Multiple Products Unrestricted File Upload Vulnerability

Q: How do I fix CVE-2024-50623?

harmony: upgrade to 5.8.0.21; lexicom: upgrade to 5.8.0.21; vltrader: upgrade to 5.8.0.21. Exact commands for each OS are on this page.

Q: Is CVE-2024-50623 being exploited?

Yes. CVE-2024-50623 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

Q: What does CVE-2024-50623 affect?

CVE-2024-50623 affects harmony, lexicom, vltrader. Severity is critical (CVSS 9.8). 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.

Q: How urgent is CVE-2024-50623?

Priority 99/100. Critical severity; EPSS top 1%: very likely to be exploited; Exploited in the wild (CISA KEV); Used in ransomware campaigns; Public exploit reference; Remotely exploitable, no login, no user action

Patch now

CRITICAL 9.8EXPLOITEDREMOTEUPGRADEUPGRADEUPGRADE

CVE-2024-50623 is a critical-severity flaw (CVSS 9.8) affecting harmony, lexicom, vltrader, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Exploited in the wild (CISA KEV)
Used in ransomware campaigns
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	98.6% (top 1%)
CISA exploited list	Yes, fix due 2025-01-03, used in ransomware
Weakness	CWE-434
Published	2024-10-28
Last modified	2026-10-08

Publisher (CNA): MITRE · Vendor: cleo

Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-10-28 00:15 UTCPublished CVE record published
2024-12-13Exploited Added to the CISA Known Exploited Vulnerabilities list
2025-01-03Deadline CISA due date for US federal agencies to patch
2026-10-08 10:35 UTCUpdated Record last modified

cleo harmony UPGRADE

Affected: < 5.8.0.21

Fixed in: 5.8.0.21

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy harmony || rpm -q harmony || harmony --version

2. UPGRADE to 5.8.0.21 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade harmony

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade harmony

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

cleo lexicom UPGRADE

Affected: < 5.8.0.21

Fixed in: 5.8.0.21

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy lexicom || rpm -q lexicom || lexicom --version

2. UPGRADE to 5.8.0.21 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade lexicom

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade lexicom

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

cleo vltrader UPGRADE

Affected: < 5.8.0.21

Fixed in: 5.8.0.21

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy vltrader || rpm -q vltrader || vltrader --version

2. UPGRADE to 5.8.0.21 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade vltrader

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade vltrader

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · byobu · FIXED · 7.23-1.fc46 · FEDORA-2026-08f2b53446 · source

sudo dnf upgrade --advisory=FEDORA-2026-08f2b53446

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: watchtowrlabs/CVE-2024-50623 (25 stars)
GitHub PoC: verylazytech/CVE-2024-50623 (7 stars)
GitHub PoC: iSee857/Cleo-CVE-2024-50623-PoC (5 stars)
Write-up: support.cleo.com/hc/en-us/articles/27140294267799-Cleo-Product-Security-Advisory
GitHub PoC: congdong007/CVE-2024-50623-poc
Nuclei scan template: Cleo Harmony < 5.8.0.21 - Arbitary File Read

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-50623?

harmony: upgrade to 5.8.0.21; lexicom: upgrade to 5.8.0.21; vltrader: upgrade to 5.8.0.21. Exact commands for each OS are on this page.

Is CVE-2024-50623 being exploited?

Yes. CVE-2024-50623 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2024-50623 affect?

CVE-2024-50623 affects harmony, lexicom, vltrader. Severity is critical (CVSS 9.8). 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.

How urgent is CVE-2024-50623?

Priority 99/100. Critical severity; EPSS top 1%: very likely to be exploited; Exploited in the wild (CISA KEV); Used in ransomware campaigns; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Cleo vulnerabilities

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References

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