VulnTideExploited vulnerabilities, by vendor. Data as of 28 Oct 2026.
Known exploitedIn CISA's KEV catalog since 3 February 2026Ransomware use: unknown
SolarWinds Web Help Desk

CVE-2025-40551: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 3 Feb 2026, 6 days after the CVE record was published.

How likely is exploitation in the next 30 days?
84.2%

EPSS score, percentile 99.7 of all scored records

How severe?
9.8 Critical

CVSS v3.1 base score, given by the CNA

What should I do?

CISA deadline 6 Feb 2026. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Advisories and patches (2)

Which versions are affected?

Affected

  • 12.8.8 HF1 and below

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

Required action, set by CISA

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

CISA due date for this action: 6 February 2026.

Solution (from the CVE record)

SolarWinds recommends customers upgrade to Web Help Desk version 2026.1.

Advisories and patches

Linked from CISA's catalog entry

Affected products and versions

As listed in the CVE record.

SolarWinds Web Help Desk
StatusVersions
Affected12.8.8 HF1 and below

Versions not listed are: affected.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this 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.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

  • CISA added CVE-2025-40551 to its Known Exploited Vulnerabilities (KEV) catalog on 3 Feb 2026.
  • CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
  • The due date CISA sets for the required action is 6 Feb 2026.
  • The CVE record was published on 28 Jan 2026, 6 days before it was added to KEV.
  • The CVE record carries a CVSS v3.1 base score of 9.8 (Critical), given by its CNA.
  • FIRST's EPSS model puts the probability of exploitation in the next 30 days at 84.2% (percentile 99.7), as of 28 Oct 2026.
  • CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

Description

SolarWinds Web Help Desk Deserialization of Untrusted Data Remote Code Execution Vulnerability

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.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

  • CWE-502: Deserialization of Untrusted Data

Attack patterns (CAPEC)

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

DateEvent
28 Jan 2026CVE record published
3 Feb 2026Added to CISA KEV
6 Feb 2026CISA due date for the required action
7 Oct 2026CVE record last updated

More exploited SolarWinds vulnerabilities

  • CVE-2026-28318: SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability (added 5 Jun 2026)
  • CVE-2025-26399: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability (added 9 Mar 2026)
  • CVE-2025-40536: SolarWinds Web Help Desk Security Control Bypass Vulnerability (added 12 Feb 2026)
  • CVE-2024-28987: SolarWinds Web Help Desk Hardcoded Credential Vulnerability (added 15 Oct 2024)
  • CVE-2024-28986: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability (added 15 Aug 2024)
  • CVE-2024-28995: SolarWinds Serv-U Path Traversal Vulnerability (added 17 Jul 2024)