# CVE-2025-40551: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability

- Exploited (CISA KEV): yes, added 2026-02-03
- Published: 2026-01-28
- CVSS: 9.8 CRITICAL (v3.1)
- EPSS: 84.2% (100th percentile)
- CWE: CWE-502

SolarWinds Web Help Desk was found to be susceptible to an untrusted data deserialization vulnerability that could lead to remote code execution, which would allow an attacker to run commands on the host machine. This could be exploited without authentication.

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

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

## Our test (measured)

- OWASP Core Rule Set 4.25.0, paranoia level 1, anomaly threshold 5, default CRS settings: partial (1 of 6 requests blocked), template CVE-2025-40551, 2026-11-02
- OWASP Core Rule Set 4.25.0, paranoia level 2, anomaly threshold 5, default CRS settings: partial (2 of 6 requests blocked), template CVE-2025-40551, 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-2025-40551 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2025-40551