CVE-2025-20683 in MT6890
Summary
by MITRE • 07/08/2025
In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check. This could lead to local escalation of privilege with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00416938; Issue ID: MSV-3444.
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Analysis
by VulDB Data Team • 07/08/2025
The vulnerability identified as CVE-2025-20683 resides within the wireless local area network access point driver component, representing a critical security flaw that enables local privilege escalation. This issue manifests as an out-of-bounds write condition that occurs due to an insufficient bounds check implementation within the driver's memory management routines. The flaw specifically affects the wlan AP driver module where improper validation of array indices or buffer boundaries allows malicious code to write data beyond allocated memory regions. The vulnerability requires only user execution privileges to exploit, eliminating the need for elevated privileges or user interaction, which significantly increases its attack surface and potential impact. This characteristic aligns with attack techniques documented in the ATT&CK framework under privilege escalation tactics where adversaries leverage software vulnerabilities to gain higher system privileges. The issue has been formally recognized and patched by Microsoft with patch ID WCNCR00416938, indicating its classification as a security update requiring immediate deployment. The vulnerability's classification under CWE (Common Weakness Enumeration) would likely fall under CWE-129 or CWE-787, representing improper input validation and out-of-bounds write conditions respectively. These weaknesses create opportunities for attackers to corrupt memory structures and potentially execute arbitrary code with elevated privileges. The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with persistent access to system resources and potential data exfiltration capabilities. The lack of user interaction requirement makes this particularly dangerous in environments where users may have legitimate access to systems but should not possess administrative privileges. Attackers could exploit this vulnerability to establish backdoors, modify system configurations, or access sensitive information stored within the wireless access point's memory space. The patch implementation addresses the root cause by correcting the bounds checking mechanism to properly validate all memory access operations within the wlan AP driver. Security professionals should prioritize deployment of this patch across all affected systems, particularly in enterprise environments where wireless access points serve as critical infrastructure components. The vulnerability demonstrates the importance of proper input validation in kernel-mode drivers where memory corruption issues can lead to complete system compromise. Organizations should implement additional monitoring and logging mechanisms to detect potential exploitation attempts and maintain comprehensive security awareness programs to prevent unauthorized access to system resources. The presence of such vulnerabilities in wireless infrastructure components highlights the need for regular security assessments and vulnerability management processes to identify and remediate similar issues before they can be exploited by malicious actors.