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PatchSiren cyber security CVE debrief

CVE-2026-20452 MediaTek, Inc. CVE debrief

A heap buffer overflow vulnerability in a WLAN Access Point (AP) driver may allow remote proximal/adjacent attackers to achieve code execution. The flaw requires User execution privileges but does not require user interaction for exploitation. The vulnerability was disclosed in MediaTek's June 2026 Product Security Bulletin with Patch ID WCNCR00480138 and Issue ID MSV-6295. The weakness is classified as CWE-122 (Heap-based Buffer Overflow). As of the CVE publication date of June 1, 2026, the vulnerability status in NVD is 'Received' and no CVSS score has been assigned. The affected vendor is identified as MediaTek based on reference domain evidence, though this attribution carries low confidence and requires review. No known exploitation in ransomware campaigns has been documented, and the vulnerability is not listed in CISA's Known Exploited Vulnerabilities (KEV) catalog.

Vendor
MediaTek, Inc.
Product
MediaTek chipset
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-01
Original CVE updated
2026-06-01
Advisory published
2026-06-01
Advisory updated
2026-06-01

Who should care

Organizations deploying MediaTek-based wireless access points or WLAN infrastructure; network administrators managing enterprise Wi-Fi deployments; security teams responsible for wireless network segmentation and firmware lifecycle management

Technical summary

The vulnerability exists in a WLAN Access Point driver where improper bounds checking on a heap-allocated buffer can result in memory corruption. An attacker within proximal or adjacent network range may exploit this flaw to execute arbitrary code with User privileges. No user interaction is required. The root cause is categorized as CWE-122 (Heap-based Buffer Overflow). Remediation is provided through MediaTek Patch ID WCNCR00480138.

Defensive priority

high

Recommended defensive actions

  • Apply Patch ID WCNCR00480138 from MediaTek when available
  • Monitor MediaTek Product Security Bulletin for updated firmware
  • Restrict WLAN AP management interfaces to trusted administrative hosts
  • Segment wireless access point management traffic from user data networks
  • Monitor for anomalous wireless driver crashes or unexpected AP behavior
  • Review access point logs for unexplained restarts or memory corruption indicators

Evidence notes

Vendor attribution derived from reference domain candidate 'Mediatek' with low confidence; marked for review. CWE-122 identified as primary weakness by [email protected]. Patch and issue IDs confirmed in source reference.

Official resources

MediaTek Product Security Bulletin (June 2026)