CVE-2025-6334 D-Link DIR-867 Query String strncpy stack-based overflow

High 8.7 Published 20 Jun 2025 Updated 20 Jun 2025

Remote attackers can trigger a stack-based buffer overflow in the query string handler of unsupported D-Link DIR-867 routers, potentially leading to code execution or denial of service.

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

What is CVE-2025-6334?

CVE-2025-6334 is a high-severity memory corruption vulnerability in D-Link DIR-867, published on 20 Jun 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability has been found in D-Link DIR-867 1.0 and classified as critical. This vulnerability affects the function strncpy of the component Query String Handler. The manipulation leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

Weakness: CWE-121, CWE-119

Which versions are affected by CVE-2025-6334?

It affects 1 product.

Products include Dlink Dir-867 Firmware.

How do I fix CVE-2025-6334?

No fix has been published for CVE-2025-6334 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-2025-6334 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6334 exists.

Sources

Also known as GHSA-f3pg-qv5p-58pw.