CVE-2025-20742 Memory corruption in MT6890, MT7603, MT7615, MT7622, MT7915, MT7916, MT7981, MT7986

High 8.0 Published 4 Nov 2025 Updated 26 Feb 2026

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

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-2025-20742?

CVE-2025-20742 is a high-severity memory corruption vulnerability in Mediatek Software Development Kit, published on 4 Nov 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) escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00432680; Issue ID: MSV-3949.

Weakness: CWE-787, CWE-122

Which versions are affected by CVE-2025-20742?

It affects 2 products.

Products include Mediatek Software Development Kit, Openwrt Openwrt.

How do I fix CVE-2025-20742?

No fix has been published for CVE-2025-20742 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-2025-20742 being exploited?

There is no known exploitation of CVE-2025-20742 in the wild and no public exploit code.

All Mediatek Software Development Kit vulnerabilities

Sources

Also known as GHSA-xfp6-6hcf-pxmv.