CVE-2025-40553
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 Feb 27, 2026
Key Facts
Patch immediately- CVE-2025-40553 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Web Help Desk (Solarwinds).
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Sep 1, 2026. Public exploit code is available.
- EPSS estimates a 68% 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)
68%
Higher than 99.3% of all scored CVEs
Exploited in the wild
Yes
2 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
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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 |
|---|---|---|---|
| Industry KEV feed | Sep 1, 2026 | n/a | Not reported |
| CIRCL KEV | Sep 1, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or 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
Publicly disclosed
Feb 9, 2026
Last updated
Feb 27, 2026
Added to Industry KEV feed
Sep 1, 2026
Added to CIRCL KEV
Sep 1, 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-2025-40553
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 Industry KEV feed, CIRCL KEV since Sep 1, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
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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