CVE-2026-20419 Denial of service in MediaTek chipset
A remote attacker can cause a denial of service in MediaTek WiFi firmware via an uncaught exception, 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-2026-20419?
CVE-2026-20419 is a medium-severity denial of service vulnerability in Mediatek Software Development Kit, published on 2 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In wlan AP/STA firmware, there is a possible system becoming irresponsive due to an uncaught exception. This could lead to remote (proximal/adjacent) denial of service with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00461663 / WCNCR00463309; Issue ID: MSV-4852.
Weakness: CWE-754
Which versions are affected by CVE-2026-20419?
It affects 3 products.
Products include Mediatek Nbiot Sdk, Mediatek Software Development Kit, Openwrt Openwrt.
How do I fix CVE-2026-20419?
No fix has been published for CVE-2026-20419 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-2026-20419 being exploited?
There is no known exploitation of CVE-2026-20419 in the wild and no public exploit code.
Other vulnerabilities in Mediatek Software Development Kit
Sources
Also known as GHSA-4q2v-rcwc-rv6w.