CVE-2025-40551
SolarWinds — SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
SolarWinds · CWE-502 — Deserialization of untrusted data · in CISA KEV since 2026-02-03
EVRS 86 of 100 Immediate
Patch Immediately
Rank 359 of 2,960 tracked
Why it scores 86
Evidence available: 6 of 7 signalsListed in the CISA KEV catalog, and an EPSS probability of 0.842.
- CISA KEVApplied
- RansomwareDid not apply
- Vendor exploitationDid not apply
- EPSSApplied
- Microsoft Exploitability IndexNot applicable
- Pre-patch disclosureNo data
- KEV recencyDid not apply
- CVSSApplied
The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data
Fix
Patch or fixed version identifiedCISA required action
Fixed in
web help desk: update to 2026.1 or later
Affected versions
- web help desk
< 2026.1
Remediation
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Fixed versions from NVD.
Evidence
Each value with its source| Measure | Value | Source |
|---|---|---|
| CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. | 9.8 | NVD |
| FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. | 0.842 (99.7th pctl) | FIRST EPSS |
| Actively exploitedWhether a source of record has confirmed attacks using it in the wild. | Confirmed | CISA KEV |
| Ransomware campaign useWhether CISA has seen ransomware operators use it. | Unknown or none | CISA KEV |
| CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. | 2026-02-06 · CISA federal deadline · Overdue by 8 months | CISA KEV |
| Public exploit moduleA module existing is not the same as active exploitation. | Public module exists | Metasploit |
| EUVD cross-referenceENISA's record: CVSS 9.8 (v3.1), assigned by SolarWinds. | Listed | ENISA EUVD |
Description
NVDSolarWinds 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.
What CISA says to do
Public module
Metasploit lists a public great-rank module for this CVE: SolarWinds Web Help Desk unauthenticated RCE (multi/http/solarwinds_webhelpdesk_rce). A module existing is not the same as active exploitation; see metasploit.com.