CVE-2021-33270: D-Link Dir-809 Firmware

Critical severity, CVSS 9.8. EPSS: 4% chance of exploitation in the next 30 days.

D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability in the function FUN_800462c4 in /formAdvFirewall. This vulnerability is triggered via a crafted POST request.

Affected products

• D-Link Dir-809 Firmware: up to and including 1.12wwb03

Published 2021-12-01. Last modified 2026-06-17.