Is CVE-2021-33269 actively exploited?

No active exploitation of CVE-2021-33269 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-33269 be exploited remotely?

Yes. CVE-2021-33269 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-33269?

CVE-2021-33269 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-33269

CRITICAL

CVE-2021-33269

CWE-787Published: December 1, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official 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_8004776c in /formVirtualServ. This vulnerability is triggered via a crafted POST request.

NVD Source

Technical Analysis

CVE-2021-33269 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.