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CVE-2025-40551

KEVSolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
Description

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.

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.

CVSS 3.1 vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
PublishedJan 28, 2026
Last modifiedJun 17, 2026
Added to KEVFeb 3, 2026
Remediation dueFeb 6, 2026
References
0 recent articles mention this CVE
    87
    Risk assessment · Critical

    Actively exploited. Patch immediately.

    Exploitation
    Confirmed in the wild (CISA KEV)
    Federal remediation deadline
    Overdue by 263 days
    CVSS
    9.8 CRITICAL
    EPSS (30-day exploit probability)
    84.2% · top 1% of all CVEs
    Weakness
    CWE-502
    Attack vector
    Network, remotely reachable
    Preconditions
    No privileges and no user interaction
    Recommended actions
    1. 1.Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
    2. 2.Treat as emergency change: patch or isolate internet-facing instances first.
    3. 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
    4. 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.

    Assessment is derived automatically from the live signals above; verify against your own asset inventory.