CVE-2021-33271 Memory corruption in n/a

Critical 9.8 Published 1 Dec 2021 Updated 3 Aug 2024

A stack buffer overflow in D-Link DIR-809 routers allows remote attackers to execute arbitrary code or cause a denial of service via a crafted POST request.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-33271?

CVE-2021-33271 is a critical memory corruption vulnerability in n/a, published on 1 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

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

Weakness: CWE-787

Which versions are affected by CVE-2021-33271?

It affects 1 product.

Products include Dlink Dir-809 Firmware.

How do I fix CVE-2021-33271?

No fix has been published for CVE-2021-33271 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-33271 being exploited?

There is no known exploitation of CVE-2021-33271 in the wild and no public exploit code.

Sources

Also known as GHSA-3rm9-3r67-x775.