What is CVE-2025-40547?

CVE-2025-40547 is a critical-severity vulnerability in Solarwinds Serv-U, classified under Improper Encoding or Escaping of Output. CVSS score: 9.1/10. Published 2025-11-18.

How severe is CVE-2025-40547?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Solarwinds Serv-U

CVE-2025-40547

A logic error vulnerability exists in Serv-U which when abused could give a malicious actor with access to admin privileges the ability to execute code. 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.

Published 2025-11-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (57.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Solarwinds Serv-U — versions SolarWinds Serv-U 15.5.2 and prior versions

Weakness classification (CWE)

CWE-116 — Improper Encoding or Escaping of Output

References

www.solarwinds.com/trust-center/security-advisories/CVE-2025-40547 (Vendor Advisory)
documentation.solarwinds.com/en/success_center/servu/content/release_notes/serv… (Release Notes)

Frequently asked questions

What is CVE-2025-40547?: CVE-2025-40547 is a critical-severity vulnerability in Solarwinds Serv-U, classified under Improper Encoding or Escaping of Output. CVSS score: 9.1/10. Published 2025-11-18.
How severe is CVE-2025-40547?: Critical severity. CVSS v3 base score is 9.1 out of 10.