CVE-2025-5621: D-Link Dir-816 Firmware

Critical severity, CVSS 9.8. EPSS: 7.5% chance of exploitation in the next 30 days.

A vulnerability has been found in D-Link DIR-816 1.10CNB05 and classified as critical. Affected by this vulnerability is the function qosClassifier of the file /goform/qosClassifier. The manipulation of the argument dip_address/sip_address leads to os command injection. The attack can be launched 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-816 Firmware: version 1.10cnb05 only

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