CVE-2025-20686 Memory corruption in MT6890, MT7915, MT7916, MT7981, MT7986

High 8.8 Published 8 Jul 2025 Updated 8 Jul 2025

A remote attacker can execute arbitrary code via an out-of-bounds write in the MediaTek Wi-Fi AP driver without user interaction.

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

What is CVE-2025-20686?

CVE-2025-20686 is a high-severity memory corruption vulnerability in Mediatek Software Development Kit, published on 8 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote (proximal/adjacent) code execution with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00415570; Issue ID: MSV-3404.

Weakness: CWE-122

Which versions are affected by CVE-2025-20686?

It affects 2 products.

Products include Mediatek Software Development Kit, Openwrt Openwrt.

How do I fix CVE-2025-20686?

No fix has been published for CVE-2025-20686 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-2025-20686 being exploited?

There is no known exploitation of CVE-2025-20686 in the wild and no public exploit code.

All Mediatek Software Development Kit vulnerabilities

Sources

Also known as GHSA-6h67-fg36-25hf.