CVE-2025-4340: D-Link Dir-806 Firmware

Critical severity, CVSS 9.8. EPSS: 5.3% chance of exploitation in the next 30 days.

A vulnerability classified as critical has been found in D-Link DIR-890L and DIR-806A1 up to 100CNb11/108B03. Affected is the function sub_175C8 of the file /htdocs/soap.cgi. The manipulation leads to command injection. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

Affected products

• D-Link Dir-806 Firmware: up to and including 100cnb11
• D-Link Dir-890l Firmware: up to and including 1.08b03

Published 2025-05-06. Last modified 2026-06-17.