Critical severity9.8NVD Advisory· Published Dec 1, 2021· Updated Jun 17, 2026

CVE-2021-33270

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Dlink/Dir 809 Firmware
cpe:2.3:o:dlink:dir-809_firmware:*:*:*:*:*:*:*:*
Range: <=1.12wwb03
D-Link/DIR-809 devicesdescription
Dlink/DIR-809llm-create
Range: <=DIR-809Ax_FW1.12WWB03_20190410

Patches

Vulnerability mechanics

References

github.com/Lnkvct/IoT-poc/tree/master/D-Link-DIR809/vuln06nvdExploitThird Party Advisory
www.dlink.com/en/security-bulletin/nvdVendor Advisory

News mentions

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cvss	0.637
epss	0.003
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000