CVE-2025-40547: serv-u Improper Encoding — Fix

Description

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.

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CVSS v3.1 Score

9.1

CRITICAL

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

Weakness Type (CWE)

CWE-116 CWE-116

Affected Products

Vendor	Product	Versions
solarwinds	serv-u	< 15.5.3

References

Advisories & Patches

https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-40547

Other References

https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-3_release_notes.htm

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2025-40547? +

CVE-2025-40547 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-40547? +

CVE-2025-40547 affects products from solarwinds, specifically: serv-u. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-40547? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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