Vulnerability record · CVE-2021-33265 · published 1 December 2021

CVE-2021-33265: Dlink dir-809 firmware out-of-bounds write vulnerability

Dlink · Dir 809 Firmware

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_80046eb4 in /formSetPortTr. This vulnerability is triggered via a crafted POST request.

9.8 CVSS 3.1 Critical EPSS 14% · top 3.6% CWE-787 · Out-of-bounds write

9.8CVSS 3.1 base score, v2 7.2

14%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

4References, 2 tagged exploit

17 Jun 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Dir 809 Firmware Dlink

References

Link	Tags
https://github.com/Lnkvct/IoT-poc/tree/master/D-Link-DIR809/vuln05	ExploitThird Party Advisory
https://www.dlink.com/en/security-bulletin/	Vendor Advisory
https://github.com/Lnkvct/IoT-poc/tree/master/D-Link-DIR809/vuln05	ExploitThird Party Advisory
https://www.dlink.com/en/security-bulletin/	Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2014-8361Realtek SDK miniigd SOAP service remote code executionThe miniigd SOAP service in the Realtek SDK fails to properly validate input in a NewInternalClient request, allowing remote code execution. The flaw…KEVEPSS 100%analysed1 May 2015 9.8CVE-2021-33266Dlink dir-809 firmware out-of-bounds write vulnerabilityD-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability in the f…EPSS 17%1 Dec 2021 9.8CVE-2021-33267Dlink dir-809 firmware out-of-bounds write vulnerabilityD-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability in the f…EPSS 4.0%1 Dec 2021 9.8CVE-2021-33268Dlink dir-809 firmware out-of-bounds write vulnerabilityD-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability in the f…EPSS 4.1%1 Dec 2021 9.8CVE-2021-33269Dlink dir-809 firmware out-of-bounds write vulnerabilityD-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability in the f…EPSS 4.0%1 Dec 2021 9.8CVE-2021-33270Dlink dir-809 firmware out-of-bounds write vulnerabilityD-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability in the f…EPSS 4.0%1 Dec 2021 9.8CVE-2021-33271Dlink dir-809 firmware out-of-bounds write vulnerabilityD-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability in the f…EPSS 4.0%1 Dec 2021 9.8CVE-2021-33274Dlink dir-809 firmware out-of-bounds write vulnerabilityD-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability in the f…EPSS 4.0%1 Dec 2021

Source: NIST National Vulnerability Database (record CVE-2021-33265), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.