CVE-2026-20525 Denial of service in MediaTek chipset

Medium 5.3 Published 5 Oct 2026 Updated 5 Oct 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: None listed

What is CVE-2026-20525?

CVE-2026-20525 is a medium-severity denial of service vulnerability in MediaTek, Inc. MediaTek chipset, published on 5 Oct 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 improper input validation. 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: MOLY01870473 / MOLY00814393; Issue ID: MSV-9041.

Weakness: CWE-617

Which versions are affected by CVE-2026-20525?

It affects 22 products.

Products include Mediatek Mt2716 Firmware, Mediatek Mt6835 Firmware, Mediatek Mt6858 Firmware, Mediatek Mt6878 Firmware, Mediatek Mt6881 Firmware, Mediatek Mt6897 Firmware and 16 more.

How do I fix CVE-2026-20525?

No fix has been published for CVE-2026-20525 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-2026-20525 being exploited?

There is no known exploitation of CVE-2026-20525 in the wild and no public exploit code.

Sources

Also known as GHSA-gr3f-92cw-g5f6.