A high-severity heap overflow vulnerability in MediaTek wlan drivers could allow a local attacker with user-level privileges to escalate their permissions on the affected system.

This is a heap overflow vulnerability (CWE-122) triggered by an incorrect bounds check within the wlan STA driver. Successful exploitation requires the attacker to already possess local user execution privileges, but no user interaction is required to achieve escalation.

The ability for a local user to escalate privileges to a higher level poses a significant risk to system integrity and confidentiality. By gaining elevated access, an attacker could bypass security controls, access sensitive data, or install persistent malicious software, leading to a complete compromise of the host system. Given the CVSS score of 7.8, this flaw represents a high-risk entry point for lateral movement within a corporate network.

Immediate Action: Update the affected MediaTek wlan drivers or apply the vendor-provided patch WCNCR00447115 as detailed in the November 2025 MediaTek security bulletin.

Proactive Monitoring: Monitor system logs for unusual driver crashes or unexpected process elevation attempts that may indicate exploitation of the wlan driver.

Compensating Controls: Restrict local user access to sensitive system configurations and ensure that the principle of least privilege is strictly enforced to limit the potential impact of local privilege escalation.

Public Exploit Available: No — there is no confirmed public exploit in the available data.

Organizations utilizing MediaTek hardware within the specified SDK versions must prioritize the application of the vendor patch. Because this vulnerability allows for local privilege escalation, it is imperative to address this flaw to prevent attackers from deepening their control over compromised endpoints. Please consult the official MediaTek product security bulletin for integration instructions.