CVE-2026-91001: D-Link Di-8400

Critical severity, CVSS 9.9. EPSS: 0.9% chance of exploitation in the next 30 days.

A security flaw has been discovered in D-Link DI-8400 16.07. This affects the function ddns_asp of the file /ddns.asp of the component DDNS Configuration. Performing a manipulation of the argument serv/user/host/wild/mx/bmx/cust/ip results in stack-based buffer overflow. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks.

Affected products

• D-Link Di-8400: version 16.07 only

Published 2026-09-15. Last modified 2026-09-15.