SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
SolarWinds — Web Help Desk
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.
9.8
84.1%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- Jan 28, 2026
- Modified
- Feb 26, 2026
- Added to KEV
- Feb 3, 2026
- Federal patch due
- Feb 6, 2026
CISA 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.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2025-40551, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2025-40551 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
Frequently asked questions
What is CVE-2025-40551?
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.
How severe is CVE-2025-40551?
CVE-2025-40551 has a CVSS base score of 9.8 out of 10 (CVSS 3.1).
Is CVE-2025-40551 actively exploited in the wild?
Yes. CVE-2025-40551 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Feb 3, 2026, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2025-40551?
84.1% - meaning FIRST.org's EPSS model estimates a 84.1% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2025-40551?
Yes - a public Nuclei template referencing CVE-2025-40551 exist in public repositories we checked.
What type of vulnerability is CVE-2025-40551?
CVE-2025-40551 is classified under CWE-502 (CWE-502 Deserialization of Untrusted Data).
Cross-checked against
Impactr finds and proves whether CVE-2025-40551 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
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