SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
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.
- Vendor
- SolarWinds
- Product
- Web Help Desk
- CVSS
- 9.8
- EPSS (exploit probability)
- 84.2%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2025-40551 being exploited?
Yes. CISA added CVE-2025-40551 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 84.2% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-21. Full cross-catalog view: /kev-comparison
What to do
CISA required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
US federal civilian agencies must remediate by (3 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other SolarWinds Web Help Desk CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2025-26399 SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerabilityransomware use | [ CRITICAL ] | 9.8 | 90.1% | |
| CVE-2025-40536 SolarWinds Web Help Desk Security Control Bypass Vulnerability | [ HIGH ] | 8.1 | 73.6% | |
| CVE-2024-28987 SolarWinds Web Help Desk Hardcoded Credential Vulnerability | [ CRITICAL ] | 9.1 | 93.3% | |
| CVE-2024-28986 SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability | [ CRITICAL ] | 9.8 | 84.6% |