# CVE-2024-20439: Cisco Smart Licensing Utility Static Credential Vulnerability

- Exploited (CISA KEV): yes, added 2025-03-31
- Published: 2024-09-04
- CVSS: 9.8 CRITICAL (v3.1)
- EPSS: 97.1% (100th percentile)
- CWE: CWE-912

A vulnerability in Cisco Smart Licensing Utility (CSLU) could allow an unauthenticated, remote attacker to log into an affected system by using a static administrative credential.

 This vulnerability is due to an undocumented static user credential for an administrative account. An attacker could exploit this vulnerability by using the static credentials to login to the affected system. A successful exploit could allow the attacker to login to the affected system with administrative rights over the CSLU application API.

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

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Before feed history | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2024-09-17 | 13 |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### F5

- 2024-09-17 · new · rule 200013095
  > Added: signature 200013095 "Cisco Smart Licensing Utility Default Credentials" (Authentication/Authorization Attacks, risk High), systems: Cisco. References: CVE-2024-20439.
  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: passed (0 of 1 requests blocked), template CVE-2024-20439, 2026-11-02
- OWASP Core Rule Set 4.25.0, paranoia level 2, anomaly threshold 5, default CRS settings: passed (0 of 1 requests blocked), template CVE-2024-20439, 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-2024-20439 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2024-20439