CVE-2021-21913: D-Link Dir-3040 Firmware

Critical severity, CVSS 9.8. EPSS: 2.2% chance of exploitation in the next 30 days.

An information disclosure vulnerability exists in the WiFi Smart Mesh functionality of D-LINK DIR-3040 1.13B03. A specially-crafted network request can lead to command execution. An attacker can connect to the MQTT service to trigger this vulnerability.

Affected products

• D-Link Dir-3040 Firmware: version 1.13b03 only

Published 2021-09-23. Last modified 2026-06-17.