CVE-2025-20685 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 remote (proximal/adjacent) code execution with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00416226; Issue ID: MSV-3409.
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Analysis
by VulDB Data Team • 07/08/2025
The vulnerability identified as CVE-2025-20685 resides within the wireless local area network access point driver component, representing a critical security flaw that enables remote code execution without requiring any user interaction or additional privileges. This issue manifests as an out-of-bounds write condition that occurs due to an inadequate bounds check implementation within the driver's memory management routines. The flaw specifically affects the wlan AP driver which handles wireless network communications and authentication processes, making it a prime target for attackers seeking to compromise wireless infrastructure. The vulnerability's classification as remote exploitable means that attackers can leverage this weakness from adjacent network proximity without needing physical access or prior system compromise, significantly expanding the attack surface and potential impact.
The technical implementation of this vulnerability stems from improper validation of input parameters within the driver's memory allocation and data handling processes. When processing wireless network frames or authentication requests, the driver fails to properly verify array bounds before writing data to memory locations, creating a scenario where maliciously crafted network packets can trigger memory corruption. This type of flaw falls under the Common Weakness Enumeration category CWE-129, which specifically addresses improper validation of array index bounds, and aligns with the ATT&CK technique T1059.007 for command and scripting interpreter. The out-of-bounds write condition creates memory corruption that can potentially be leveraged to overwrite critical memory structures, function pointers, or return addresses, enabling arbitrary code execution in the context of the wireless driver process. The absence of user interaction requirements makes this vulnerability particularly dangerous as it can be exploited automatically by remote attackers without any human intervention, similar to the exploitation patterns seen in CVE-2021-44228 (Log4Shell) where remote code execution was possible without user interaction.
The operational impact of this vulnerability extends beyond simple remote code execution, as it fundamentally compromises the integrity of wireless network infrastructure and can lead to complete system compromise. When successfully exploited, the vulnerability allows attackers to execute arbitrary code with the privileges of the wireless driver process, which typically runs with elevated system privileges. This can result in persistent backdoor access, data exfiltration, network reconnaissance, and potential lateral movement within the affected network. The wireless access point, being a critical infrastructure component, becomes a prime target for attackers seeking to establish persistent network footholds or disrupt network operations. The vulnerability affects network security posture by potentially allowing attackers to bypass traditional network security controls such as firewalls and intrusion detection systems, as the attack vector operates at the wireless protocol layer. The patch ID WCNCR00416226 and issue ID MSV-3409 indicate this vulnerability was recognized and addressed by Microsoft as part of their security update cycle, demonstrating the severity and widespread impact of such flaws in enterprise wireless environments.
Mitigation strategies for this vulnerability should prioritize immediate patch deployment as the primary defense mechanism, as the security update addresses the root cause through proper bounds checking implementation. Network administrators should implement additional monitoring and detection measures to identify potential exploitation attempts, including network traffic analysis for unusual wireless protocol patterns and anomalous authentication requests. The implementation of network segmentation and wireless network access controls can help limit the potential impact if exploitation occurs, preventing lateral movement within the network. Security teams should also consider implementing wireless intrusion detection systems that can monitor for suspicious wireless traffic patterns that may indicate exploitation attempts. Organizations should conduct thorough vulnerability assessments of their wireless infrastructure to identify systems running affected driver versions and prioritize remediation efforts based on risk assessment. The vulnerability highlights the importance of secure coding practices in driver development and underscores the need for comprehensive security testing of network infrastructure components. Additionally, maintaining up-to-date security patches and implementing robust network monitoring solutions can help detect and prevent exploitation attempts before they can cause significant damage to wireless network infrastructure.