CVE-2026-19824 in W20E
Summary
by MITRE • 08/14/2026
A weakness has been identified in Tenda W20E 15.11.0.6(1068_1546_841)_CN_TDC. The affected element is the function ipMacBindListStore of the file /goform/addIpMacBind. Executing a manipulation of the argument IPMacBindRule can lead to stack-based buffer overflow. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks.
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Analysis
by VulDB Data Team • 08/14/2026
The vulnerability identified in Tenda W20E 15.11.0.6 represents a critical stack-based buffer overflow flaw within the device's web interface management functionality. This weakness exists in the ipMacBindListStore function located in the /goform/addIpMacBind file, which processes IP-MAC binding rules through the IPMacBindRule argument. The vulnerability stems from insufficient input validation and bounds checking within the affected function, creating an exploitable condition where maliciously crafted input can overwrite adjacent memory locations on the stack. The attack vector is remotely accessible, meaning that an unauthenticated attacker can exploit this vulnerability without requiring physical access to the device or prior authentication credentials.
This buffer overflow vulnerability operates under CWE-121 Stack-based Buffer Overflow, which classifies it as a fundamental memory corruption issue where data written to a buffer exceeds its allocated size and overflows into adjacent stack memory. The operational impact is severe as this flaw can potentially allow remote code execution on the affected device, enabling attackers to gain unauthorized control over the router's operations. The public availability of exploits for this vulnerability significantly increases the risk level, as it removes the barrier for attackers who may not possess advanced exploitation skills. The attack surface extends beyond simple denial of service to include complete system compromise, which could enable man-in-the-middle attacks, data exfiltration, or further network infiltration through the compromised device.
The security implications extend to various ATT&CK framework techniques including T1071.004 Application Layer Protocol DNS and T1566 Phishing, as attackers can leverage this vulnerability to establish persistent access points within networks. Network administrators should consider implementing immediate mitigations such as disabling unnecessary web management interfaces, applying firmware updates when available, and deploying network segmentation strategies to limit the potential impact of exploitation. The vulnerability also highlights the importance of proper input validation and secure coding practices, particularly in embedded systems where resource constraints may lead to insufficient security measures. Organizations should conduct comprehensive vulnerability assessments of their network infrastructure to identify similar weaknesses in other devices and implement robust monitoring solutions to detect potential exploitation attempts.