CVE-2021-34201 Memory corruption in n/a

High 7.1 Published 16 Jun 2021 Updated 9 Jul 2026

Local users can trigger buffer overflows in D-Link DIR-2640-US routers, causing process crashes or potential code execution.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-34201?

CVE-2021-34201 is a high-severity memory corruption vulnerability in n/a, published on 16 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

D-Link DIR-2640-US 1.01B04 is vulnerable to Buffer Overflow. There are multiple out-of-bounds vulnerabilities in some processes of D-Link AC2600(DIR-2640). Local ordinary users can overwrite the global variables in the .bss section, causing the process crashes or changes.

Weakness: CWE-787

Which versions are affected by CVE-2021-34201?

It affects 1 product.

Products include Dlink Dir-2640-Us Firmware.

How do I fix CVE-2021-34201?

No fix has been published for CVE-2021-34201 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-2021-34201 being exploited?

There is no known exploitation of CVE-2021-34201 in the wild and no public exploit code.

Sources

Also known as GHSA-rrqf-rmhw-fr5m.