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Known exploited vulnerability

CVE-2025-40551

criticalCVSS 3.1 9.8In CISA KEVEPSS 84%Published · SolarWinds

The short answer

CVE-2025-40551 affects SolarWinds Web Help Desk and is rated critical (CVSS 9.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-02-03: attackers are using it, so patch it first.

What it is

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.

Weakness: CWE-502.

Severity

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploited (CISA KEV)

Yes, since Feb 3, 2026

Federal due date Feb 6, 2026

EPSS, next 30 days

84%

Higher than 100% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

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

Web Help Desk. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2025-40551 being exploited?

Yes. CISA added CVE-2025-40551 to its Known Exploited Vulnerabilities catalog on 2026-02-03, with a federal remediation due date of 2026-02-06.

How do I fix CVE-2025-40551?

CISA's 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.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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