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Vulnerabilities

Vulnerability · CVE-2025-40551

SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability

Published Jan 28, 2026 · catalog updated Jun 17, 2026 · SolarWinds Web Help Desk

Patch now

CVE-2025-40551 is in the CISA known-exploited catalog, due Feb 6, 2026. Confirm SolarWinds Web Help Desk against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
84.18%
Remediation
Remediation guidance
Affected products
cpe solarwinds/web help desk · vendor 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe solarwinds/web help deskversion unspecified
  • vendor SolarWinds Web Help Deskversion unspecified

How to fix CVE-2025-40551

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-40551 is in the CISA known-exploited catalog, due Feb 6, 2026. Confirm SolarWinds Web Help Desk against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

What should an analyst verify?

CWE-502: Deserialization of Untrusted Data. EPSS 84.18%. The CISA KEV listing is the exploitation evidence. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 28, 2026 · Catalog

    Detected

    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.

  2. Feb 3, 2026 · CISA KEV

    Known exploited

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  3. Feb 6, 2026 · CISA KEV

    Remediation due

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  4. Jun 17, 2026 · Catalog

    Updated

    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.

Sources

  • CISA KEVConfirmed exploitationCVE-2025-40551

    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.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2025-40551

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-40551

    30-day exploitation probability 84.2%

    first.org
  • Metasploit ModulesPublic exploit moduleexploit_multi/http/solarwinds_webhelpdesk_rce

    Public module reference (great). Module source is not copied into this catalog.

    rapid7.com
  • NIST NVDVulnerability recordCVE-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.

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2025-40551

    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.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.