CVE-2025-40551 | SolarWinds Web Help Desk Deserialization of Untrusted Data Remote Code Execution Vulnerability

Exp

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.

Published: 2026-01-28 Last update: 2026-02-04 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-40551 is rated Critical Active Threat (96.1/100): CVSS Critical severity, with high exploitation likelihood (EPSS 84.13%, 100th percentile). CISA KEV confirms active exploitation (added 2026-02-03) affecting SolarWinds / Web Help Desk. a weakness (CWE-502) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2025-40551

Name: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability · CISA KEV detail

Exploit added: 2026-02-03

Action due: 2026-02-06

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.

Exploit prediction scoring system (EPSS) score for CVE-2025-40551

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 87.12% 84.13% -2.99%
2 2026-06-11 87.87% 87.12% -0.75%
3 2026-06-09 — 87.87% —

Full EPSS history (24 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-40551

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2025-40551

Affected software / configurations for CVE-2025-40551

Vendor Product Version Raw CPE
solarwinds web_help_desk < 2026.1 cpe:2.3:a:solarwinds:web_help_desk:*:*:*:*:*:*:*:*

References for CVE-2025-40551

cvelogic Threat Intelligence