What is the CVSS score of CVE-2025-40539?

CVE-2025-40539 has a CVSS 3.1 base score of 9.1 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Windows are affected by CVE-2025-40539?

A critical type confusion vulnerability in Serv-U allows attackers with administrative access to execute arbitrary code with elevated privileges, potentially compromising sensitive data and system…

How to fix or mitigate CVE-2025-40539?

Within 24 hours: Identify all Serv-U instances in your environment and document administrative user accounts; implement enhanced logging and monitoring of admin activities. Within 7 days: Restrict administrative access to Serv-U to only essential personnel; conduct access reviews to remove unnecessary admin privileges; isolate Serv-U instances from critical systems where possible. Within 30 days: Contact Serv-U vendor for patch availability timeline; evaluate alternative solutions or decommissioning high-risk instances; conduct full security audit of all admin account activities since deployment.

Windows CVE-2025-40539

CRITICAL

Incorrect Type Conversion or Cast (CWE-704)

2026-02-24 psirt@solarwinds.com

Windows Serv U

9.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.1 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Feb 24, 2026 - 08:16 nvd

CRITICAL 9.1

DescriptionCVE.org

A type confusion vulnerability exists in Serv-U which when exploited, gives a malicious actor the ability to execute arbitrary native code as privileged account.

This issue requires administrative privileges to abuse. On Windows deployments, the risk is scored as a medium because services frequently run under less-privileged service accounts by default.

AnalysisAI

Type confusion vulnerability in SolarWinds Serv-U enables arbitrary code execution. Second critical Serv-U vulnerability.

Technical ContextAI

CWE-704 type confusion. Incorrect type casting allows memory corruption leading to code execution.

RemediationAI

Apply SolarWinds security update.

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CVE-2025-40539 vulnerability details – vuln.today

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Windows CVE-2025-40539

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

More from same product – last 7 days

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External POC / Exploit Code