CVE-2025-40551
CriticalExploitedPublic exploitSolarWinds 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.
Published Feb 9, 2026 · Updated Oct 7, 2026 · Also known as TR-26-0023
Key Facts
Patch immediately- CVE-2025-40551 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Web Help Desk (Solarwinds).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Feb 3, 2026. Public exploit code is available.
- EPSS estimates a 84% probability of exploitation in the next 30 days.
- Fixed versions are available, including Web Help Desk 2026.1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
84%
Higher than 99.6% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2025-40551 brief as a PDF
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Feb 3, 2026 | Feb 6, 2026 | Not reported |
| Industry KEV feed | Feb 3, 2026 | Feb 6, 2026 | Not reported |
| CIRCL KEV | Feb 3, 2026 | Feb 6, 2026 | Not reported |
| ENISA EUVD | Feb 3, 2026 | n/a | Not reported |
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.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Web Help DeskSolarwinds | >= 12.8.8 HF1 and below | 2026.1 |
Patched Releases
Web Help Desk
2026.1
Timeline
Added to CISA KEV
Feb 3, 2026
Added to Industry KEV feed
Feb 3, 2026
Added to CIRCL KEV
Feb 3, 2026
Added to ENISA EUVD
Feb 3, 2026
Publicly disclosed
Feb 9, 2026
Last updated
Oct 7, 2026
Weakness Type
- CWE-502 Deserialization of Untrusted Data
References
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2025-40551
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2025-40552
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2025-40553
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2025-40554
- advisoryhttps://www.solarwinds.com/trust-center/security-advisories/CVE-2025-40551
FAQ
Common Questions.
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.
Affected: Web Help Desk (Solarwinds) versions >= 12.8.8 HF1 and below. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Feb 3, 2026.
Yes. It was added on Feb 3, 2026 with a federal remediation due date of Feb 6, 2026.
Public exploit code is available.
Fixed versions are available, including Web Help Desk 2026.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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