CVE-2024-55956: Cleo Multiple Products · Command Injection
Affects Cleo Multiple ProductsSource CVE Database V5
Exploited in the wild · used in ransomware campaigns · KEV due 7 Jan 2025 · public exploit available (Metasploit) · 93% EPSS : upgrade to 5.8.0.24 now.
Data as of 26 Oct 2026, 14:05 UTC
- KEV deadline
- US federal agencies must patch by this date; a sensible deadline for everyone else. Other KEV due dates
- Ransomware
- Used in ransomware campaigns
- EPSS
- 93.9% chance of exploitation in 30 days – higher than 99% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 5.8.0.24
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitation evidence
t = 0 is the CVE’s publication on cve.org
Disclosed: evidence found.
CVE published 13 Dec 2024
Detectable: evidence found.
nuclei template: Cleo Harmony < 5.8.0.24 - File Upload Vulnerability
Weaponised: evidence found.
Exploited in the wildExploited: evidence found.
Listed in CISA KEV 4 days after disclosure
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
Timeline
CVE published
on cve.org
, t = 0
Added to CISA KEV (opens in a new tab)
exploitation confirmed · ransomware use known
, 4 days after disclosure
KEV remediation due
US federal deadline
, 25 days after disclosure
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA KEV (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade Cleo Multiple Products to 5.8.0.24.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Cleo Multiple Products | Affected
| Fixed in
|
Description
CVE-2024-55956 affects Cleo Harmony, VLTrader, and LexiCom products prior to version 5.8.0.24. The vulnerability allows an unauthenticated attacker to import and execute arbitrary Bash or PowerShell commands on the host system by exploiting the default settings of the Autorun directory. This can lead to full system compromise. The vulnerability has a critical CVSS score of 9.8 and is known to be exploited in the wild, including use in ransomware campaigns.
References
- support.cleo.com/hc/en-us/articles/28408134019735-Cleo-Product-Security-Advisory-CVE-Pending (opens in a new tab)
- support.cleo.com/hc/en-us/articles/28408134019735-Cleo-Product-Security-Update (opens in a new tab)
- huntress.com/blog/threat-advisory-oh-no-cleo-cleo-software-actively-being-exploited-in-the-wild (opens in a new tab)
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-55956 (opens in a new tab)