CVE-2025-40539: critical vulnerability in SolarWinds Serv-U
SolarWinds Serv-U Type Confusion Remote Code Execution Vulnerability
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.1epss 0.5%
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.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Affected products
SolarWinds · Serv-URelated CVEs — SolarWinds Serv-U
In the same product, most dangerous first.
CVE-2026-28318HIGHSolarWinds Serv-U Unauthenticated Denial of Service VulnerabilityEPSS 43.7%KEVCVE-2021-35247MEDIUMImproper Input Validation Vulnerability in Serv-UEPSS 3.6%KEVCVE-2021-35250HIGHDirectory Transversal Vulnerability in Serv-U 15.3EPSS 12.8%CVE-2024-45711HIGHSolarWinds Serv-U FTP Service Directory Traversal Remote Code Execution VulnerabilityEPSS 6.3%CVE-2021-35223HIGHExecute Command Function Allows Remote Code Execution (RCE)VulnerabilityEPSS 2.9%CVE-2026-28316CRITICALSolarWinds Serv-U Insecure Direct Object Reference (IDOR) VulnerabilityEPSS 2.1%