Exploited vulnerability · CISA KEV

Is CVE-2024-55956 exploited? Yes: in CISA KEV since 17 Dec 2024

Gociux · Cleo Multiple Products · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2024-55956, Cleo Multiple Products Unauthenticated File Upload Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 17 Dec 2024, 4 days after it was published. It is known to be used in ransomware campaigns. It affects Cleo Multiple Products. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

What it is

Cleo Harmony, VLTrader, and LexiCom, which are managed file transfer products, contain an unrestricted file upload vulnerability that could allow an unauthenticated user to import and execute arbitrary bash or PowerShell commands on the host system by leveraging the default settings of the Autorun directory.

What to do

1. Check whether you run it. Look for Multiple Products in your asset inventory, including appliances and cloud images. Stack check lists every exploited Cleo CVE at once.
2. Apply the fix. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 13 Dec 2024.
4. Get told next time. Email alerts when CISA adds a CVE for Cleo.

Other exploited CVEs in Multiple Products

• CVE-2024-50623: Cleo Multiple Products Unrestricted File Upload Vulnerability (13 Dec 2024)

References

• support.cleo.com/hc/en-us/articles/28408134019735-Cleo-Product-Security-Upda
• nvd.nist.gov/vuln/detail/CVE-2024-55956

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in December 2024 · Cleo scorecard · act-now radar.