# CVE-2024-55956: Cleo Multiple Products Unauthenticated File Upload Vulnerability

- Exploited (CISA KEV): yes, added 2024-12-17, known ransomware use
- Published: 2024-12-13
- CVSS: 9.8 CRITICAL (v3.1)
- EPSS: 94.0% (100th percentile)
- CWE: CWE-276

In Cleo Harmony before 5.8.0.24, VLTrader before 5.8.0.24, and LexiCom before 5.8.0.24, an unauthenticated user can import and execute arbitrary Bash or PowerShell commands on the host system by leveraging the default settings of the Autorun directory.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Blocks by default | 2025-01-13 | 31 |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2025-01-21 | 39 |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### Cloudflare

- 2025-01-13 · new · rule 6e0bfbe4b9c6454c8bd7bd24f49e5840 · default Block
  > Cleo Harmony - Auth Bypass - CVE:CVE-2024-55956, CVE:CVE-2024-55953. Previous action: Log. New action: Block. New Detection
  Source: https://developers.cloudflare.com/changelog/post/2025-01-13-waf-release/

### F5

- 2025-01-21 · new · rule 200104999
  > Added: signature 200104999 "Cleo MFT Arbitrary File Upload" (Server Side Code Injection, risk High), systems: Java Servlets/JSP, Other Web Server. References: CVE-2024-55956.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog
- 2025-03-11 · new · rule 200104999
  > Added: signature 200104999 "Cleo MFT Arbitrary File Upload" (Server Side Code Injection, risk High), systems: Java Servlets/JSP, Other Web Server. References: CVE-2024-55956.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

## Our test (measured)

- OWASP Core Rule Set 4.25.0, paranoia level 1, anomaly threshold 5, default CRS settings: blocked (2 of 2 requests blocked), template CVE-2024-55956, 2026-11-02
- OWASP Core Rule Set 4.25.0, paranoia level 2, anomaly threshold 5, default CRS settings: blocked (2 of 2 requests blocked), template CVE-2024-55956, 2026-11-02

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2024-55956 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2024-55956