CVE-2026-20450 Denial of service in MediaTek chipset

Medium 6.5 Published 4 May 2026 Updated 4 May 2026

A remote attacker can cause a system crash in MediaTek chipsets by connecting a device to a rogue base station, requiring no user interaction or privileges.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2026-20450?

CVE-2026-20450 is a medium-severity denial of service vulnerability in MediaTek, Inc. MediaTek chipset, published on 4 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In Modem, there is a possible system crash due to incorrect error handling. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01753620; Issue ID: MSV-6100.

Weakness: CWE-617

Which versions are affected by CVE-2026-20450?

It affects 51 products.

Products include Mediatek Mt2735 Firmware, Mediatek Mt2737 Firmware, Mediatek Mt6833 Firmware, Mediatek Mt6835 Firmware, Mediatek Mt6853 Firmware, Mediatek Mt6855 Firmware and 45 more.

How do I fix CVE-2026-20450?

Apply the vendor's patch.

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-2026-20450 being exploited?

There is no known exploitation of CVE-2026-20450 in the wild and no public exploit code.

Sources

Also known as A-488946597, ASB-A-488946597, GHSA-3xqj-wm42-c6c4, M-MOLY01753620.