CVE-2025-20731 Memory corruption in MT6890, MT7615, MT7622, MT7663, MT7915, MT7916, MT7981, MT7986

Medium 4.2 Published 4 Nov 2025 Updated 26 Feb 2026

A local attacker with System privileges can escalate privileges via an out-of-bounds write in the MediaTek Wi-Fi AP driver when a specific feature is disabled.

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

What is CVE-2025-20731?

CVE-2025-20731 is a medium-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 local escalation of privilege if a malicious actor has already obtained the System privilege (when OceReducedNeighborReport is disabled). User interaction is not needed for exploitation. Patch ID: WCNCR00441511; Issue ID: MSV-4140.

Weakness: CWE-787, CWE-122

Which versions are affected by CVE-2025-20731?

It affects 2 products.

Products include Mediatek Software Development Kit, Openwrt Openwrt.

How do I fix CVE-2025-20731?

No fix has been published for CVE-2025-20731 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-2025-20731 being exploited?

There is no known exploitation of CVE-2025-20731 in the wild and no public exploit code.

All Mediatek Software Development Kit vulnerabilities

Sources

Also known as GHSA-3w28-c3v9-22gp.