CVE-2026-21051 in TencentWifiSecurity
Summary
by MITRE • 07/10/2026
Incorrect default permissions in WLAN security prior to SMR Jul-2026 Release 1 allows local attackers to configure TencentWifiSecurity settings.
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Analysis
by VulDB Data Team • 07/10/2026
This vulnerability represents a critical security flaw in the WLAN security implementation affecting devices prior to the SMR July 2026 release. The issue stems from improper default permission configurations within the Tencent Wifi Security framework, creating an exploitable condition that allows local attackers with physical or administrative access to manipulate core wireless security parameters. The root cause lies in the insufficient privilege separation and inadequate access controls that permit unauthorized modification of security settings through legitimate administrative interfaces.
The technical nature of this vulnerability aligns with CWE-276, which addresses improper permissions and access control mechanisms. Attackers can leverage this weakness to alter wireless security configurations including authentication protocols, encryption settings, and network access controls without proper authorization. This misconfiguration creates a persistent backdoor that could enable man-in-the-middle attacks, unauthorized network access, or complete compromise of the wireless infrastructure. The vulnerability is particularly concerning because it operates at the system level where local attackers already possess sufficient privileges to interact with security management interfaces.
Operationally this flaw presents significant risks to organizations relying on Tencent Wifi Security implementations, as it allows for post-exploitation persistence and privilege escalation within the wireless domain. Local attackers can configure rogue access points, modify network policies, or disable security features entirely without detection. The impact extends beyond immediate unauthorized access to include potential data exfiltration, network disruption, and compliance violations in regulated environments where wireless security controls are critical. This vulnerability directly maps to ATT&CK technique T1068, which covers local privilege escalation through improper permissions and access control weaknesses.
Mitigation strategies should prioritize immediate deployment of the SMR July 2026 release or equivalent patches that address the default permission configurations. Organizations must also implement comprehensive network monitoring to detect unauthorized configuration changes and establish strict access controls for administrative interfaces. Security teams should conduct thorough assessments of existing wireless security policies and ensure proper role-based access controls are implemented. Additional defensive measures include regular security audits, network segmentation to limit attack surface, and enhanced logging of administrative activities to provide visibility into potential exploitation attempts. The vulnerability demonstrates the importance of maintaining up-to-date firmware and security patches as well as implementing defense-in-depth strategies for wireless infrastructure protection.
This weakness exemplifies how seemingly minor permission misconfigurations can create significant security risks when they occur in critical system components. The persistence of such vulnerabilities in widely deployed systems underscores the need for robust security testing throughout the software development lifecycle and regular security assessments of deployed infrastructure. Organizations should treat this vulnerability as a high-priority remediation item due to its potential for enabling broader compromise of wireless networks and associated data assets.