CVE-2026-20456 MediaTek, Inc. CVE debrief

Who should care

Organizations managing MediaTek-based devices with WLAN capabilities, mobile device management administrators, and security teams responsible for endpoint firmware and driver update programs.

Technical summary

The vulnerability exists in the WLAN Station (STA) driver where a missing bounds check can trigger a system crash. Successful exploitation results in local denial of service. The attack vector is local, requires User execution privileges, and does not require user interaction. The weakness is categorized as CWE-787 (Out-of-bounds Write).

Defensive priority

medium

Recommended defensive actions

• Apply the vendor-provided patch (Patch ID: WCNCR00480851) from the MediaTek Product Security Bulletin when available.
• Monitor MediaTek security bulletins for updated WLAN STA driver firmware or software packages.
• Restrict local user execution privileges where possible to reduce exposure to unprivileged denial-of-service attempts.
• Validate WLAN driver versions against vendor security advisories during endpoint and mobile device management cycles.

Evidence notes

The vulnerability description and patch identifiers (Patch ID: WCNCR00480851; Issue ID: MSV-6338) are sourced from the official CVE record. The vendor attribution to MediaTek is supported by the reference domain (corp.mediatek.com) in the source item's reference list, though the vendor field carries low confidence and a review flag due to the 'reference_domain_weak' canonical source classification.

Official resources