What’s Vulnerable › Vulnerabilities

CVE-2021-33271

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-12-01 · updated 2026-06-17
• Weakness: CWE-787

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 sub_80046EB4 in /formSetPortTr. This vulnerability is triggered via a crafted POST request.

Affected products

• Dlink Dir-809 Firmware: through 1.12wwb03

References

• https://github.com/Lnkvct/IoT-poc/tree/master/D-Link-DIR809/vuln11
• https://www.dlink.com/en/security-bulletin/
• https://github.com/Lnkvct/IoT-poc/tree/master/D-Link-DIR809/vuln11
• https://www.dlink.com/en/security-bulletin/

Get alerted when CVE-2021-33271 or the next vulnerability affects your stack