Vulnary
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Critical· 9.8actively exploitedofficial fix available

CVE-2024-50623

A critical flaw allows attackers to upload any file and execute code on Cleo Harmony, VLTrader, and LexiCom systems. The vulnerability is present in versions before 5.8.0.21 and can be exploited without authentication.

publishedOct 28, 2024
last modifiedJul 31, 2026
sourcesNVD · CISA-KEV
severity · cvss
9.8
critical · how bad it is
exploitation · epss
99%
100th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Aug 30, 2026

An official fix is available, so this entry is kept for 30 days and then removed automatically.

01

Who is affected

Cleo Harmony, VLTrader, and LexiCom software versions older than 5.8.0.21. Typical users are businesses running these enterprise integration platforms.

02

Real-world impact

An attacker could upload malicious files, run arbitrary code, steal data, or take control of the affected systems.

03

Why this severity

The CVSS score of 9.8 reflects that the flaw is exploitable over the network, requires no user interaction, and can compromise confidentiality, integrity, and availability.

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade Cleo Harmony to version 5.8.0.21 or later.
  2. 02Upgrade VLTrader to version 5.8.0.21 or later.
  3. 03Upgrade LexiCom to version 5.8.0.21 or later.
  4. 04Restart the affected services to apply the update.

NVD-referenced vendor advisory

05

Timeline

  1. Oct 28, 2024 · Oct 28, 2024
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Dec 13, 2024 · Dec 13, 2024
    Confirmed exploited (CISA KEV)
    CISA added it to the Known Exploited Vulnerabilities catalog — attackers are using it in the wild.
  3. Jan 3, 2025 · Jan 3, 2025
    CISA remediation deadline
    Federal agencies are required to remediate by this date.
  4. Jul 31, 2026 · 6d ago
    Advisory updated
    The NVD record was last revised.
  5. Jul 31, 2026 · 6d ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeUnchanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
07

References & advisories

NVD advisory ↗CISA KEV catalog ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →