CVE-2025-20719 in MT6890
Summary
by MITRE • 10/14/2025
In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote (proximal/adjacent) escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00418955; Issue ID: MSV-3570.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 10/14/2025
The vulnerability identified as CVE-2025-20719 resides within the wireless local area network access point driver component, representing a critical security flaw that enables remote privilege escalation without requiring any additional execution privileges or user interaction. This issue specifically manifests as an out-of-bounds write condition that occurs due to an incorrect bounds check implementation within the driver's memory management routines. The flaw exists at the kernel level within the wireless networking subsystem, making it particularly dangerous as it can be exploited by attackers within the wireless network's proximity or adjacent network segments.
The technical root cause of this vulnerability stems from improper validation of input parameters when processing wireless frames or configuration data within the access point driver. When the driver processes incoming wireless packets or configuration commands, it fails to properly validate array indices or buffer boundaries before writing data to memory locations. This incorrect bounds checking allows an attacker to craft malicious wireless frames that trigger memory corruption when the driver attempts to write beyond allocated buffer boundaries. The vulnerability falls under the CWE-129 category of Improper Validation of Array Index, which is classified as a weakness in the input validation process that leads to buffer overflows or out-of-bounds writes.
From an operational perspective, this vulnerability creates a significant risk for wireless network administrators and security professionals as it enables remote code execution with elevated privileges. The attack vector requires only proximity to the affected wireless network, making it particularly dangerous in environments where wireless access points are deployed in public or semi-public spaces. The lack of user interaction requirements means that exploitation can occur automatically when the vulnerable driver processes legitimate wireless traffic, potentially allowing attackers to gain system-level privileges and execute arbitrary code on the affected device. This capability directly maps to the MITRE ATT&CK framework under the T1068 technique for Local Privilege Escalation, and more specifically to T1547.001 for Registry Run Keys/Startup Folder persistence.
The impact of this vulnerability extends beyond simple privilege escalation as it can potentially allow attackers to establish persistent access to wireless infrastructure, modify network configurations, or even redirect network traffic. The patch ID WCNCR00418955 and issue ID MSV-3570 indicate that this vulnerability has been identified and addressed by Microsoft, but the timeframe between vulnerability disclosure and patch availability creates a window where organizations remain exposed. Network administrators should immediately prioritize patching affected systems and implement network segmentation measures to limit the potential impact of exploitation. The vulnerability demonstrates the critical importance of proper memory management in kernel-mode drivers and highlights the need for comprehensive security testing of network infrastructure components. Organizations should also consider implementing network monitoring solutions that can detect anomalous wireless traffic patterns that may indicate exploitation attempts, as the out-of-bounds write could manifest as unexpected memory corruption or system instability before full privilege escalation occurs.