CVE-2025-20687 Denial of service in MT7902, MT7920, MT7921, MT7922, MT7925, MT7927

Medium 5.5 Published 8 Jul 2025 Updated 8 Jul 2025

A local attacker can cause a denial of service in MediaTek Bluetooth drivers via an out-of-bounds read due to incorrect bounds checking.

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-2025-20687?

CVE-2025-20687 is a medium-severity denial of service vulnerability in MediaTek, Inc. MT7902, MT7920, MT7921, MT7922, MT7925, MT7927, 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 Bluetooth driver, there is a possible out of bounds read due to an incorrect bounds check. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00418045; Issue ID: MSV-3481.

Weakness: CWE-125

Which versions are affected by CVE-2025-20687?

It affects 1 product.

Products include Mediatek Nbiot Sdk.

How do I fix CVE-2025-20687?

No fix has been published for CVE-2025-20687 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2025-20687 being exploited?

There is no known exploitation of CVE-2025-20687 in the wild and no public exploit code.

Sources

Also known as GHSA-3j66-pf2w-87jq.