Vulnerability · Published Feb 24, 2026 · Assigned by SolarWinds
CVE-2025-40539SolarWinds Serv-U Type Confusion Remote Code Execution Vulnerability
Critical 9.1
In plain English
A critical-severity security flaw in Serv-U from SolarWinds. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities).
Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)0.5%top 58.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| SolarWinds | Serv-U | SolarWinds Serv-U 15.5.3 and prior versions |
Weakness: CWE-704 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H