CVEs / CVE-2025-40551
CVE-2025-40551: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
- Known exploited in the CISA KEV catalog since 3 Feb 2026
- critical 9.8 CVSS 3.1 (from the CNA)
- EPSS 84.1% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
SolarWinds Web Help Desk contains a deserialization of untrusted data 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.
Description
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.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| SolarWinds Web Help Desk | 12.8.8 HF1 and below | — |
Exploitation
| In CISA KEV since | 3 Feb 2026 |
|---|---|
| Due date for US federal agencies | 6 Feb 2026 |
| Used in ransomware campaigns | Unknown |
| Required action | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. |
Severity
| CVSS 3.1 | 9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-502 |
References
- CVE-2025-40551 on NVD
- CVE-2025-40551 in the CISA KEV catalog
- https://www.solarwinds.com/trust-center/security-advisories/cve-2025-40551 (cited by CISA)
- https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_2026-1_release_notes.htm Release Notes
- https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-40551 Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-40551 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.