CVE-2026-75783 in TEW-WLC100P
Summary
by MITRE • 08/18/2026
A security vulnerability has been detected in TRENDnet TEW-WLC100P 12.07b01. Affected by this vulnerability is an unknown functionality of the file /sbin/netifd of the component DHCP blobmsg Handler. The manipulation leads to stack-based buffer overflow. The attack must be carried out from within the local network. The exploit has been disclosed publicly and may be used.
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Analysis
by VulDB Data Team • 08/18/2026
The TRENDnet TEW-WLC100P wireless controller, specifically running firmware version 12.07b01, contains a critical security flaw rooted in its DHCP blobmsg handler implementation within the /sbin/netifd binary. This vulnerability represents a classic stack-based buffer overflow condition that arises from insufficient bounds checking when processing network interface configuration data. The root cause lies in how the application handles variable-length input strings associated with Dynamic Host Configuration Protocol (DHCP) messages, where user-controlled or attacker-influenced data is copied into fixed-size buffers on the call stack without adequate validation of length constraints. This architectural weakness allows an adversary to overwrite adjacent memory locations, potentially overwriting return addresses and control flow pointers stored in the stack frame.
From a technical perspective, this flaw aligns with CWE-121, which defines stack-based buffer overflow as a type of vulnerability where data is written beyond the allocated boundary of a fixed-size stack buffer. The exploitation mechanism typically involves crafting malicious DHCP packets or manipulating network interface configurations to inject shellcode or ROP (Return-Oriented Programming) gadgets into the overwritten memory regions. Because the affected component resides in netifd, which manages network interfaces and routing on embedded Linux systems commonly found in IoT devices like wireless controllers, successful exploitation can lead to arbitrary code execution with the privileges of the running process. In many such firmware environments, these processes run as root or have elevated system permissions, thereby granting the attacker full control over the device operating system.
The operational impact of this vulnerability is severe due to its network-accessible nature within a local area network context. An attacker positioned on the same LAN segment can exploit this flaw without requiring prior authentication or physical access to the device console. This characteristic classifies the attack vector under MITRE ATT&CK technique T1046, Network Service Discovery, followed by exploitation via remote services such as DHCP interactions. Once exploited, the compromised controller could be used as a pivot point for lateral movement within the internal network, allowing attackers to access other connected devices, intercept sensitive traffic, or establish persistent backdoors. The public disclosure of exploit code significantly lowers the barrier to entry for malicious actors, increasing the likelihood of automated attacks and widespread compromise in environments where this specific firmware version remains deployed without immediate patching.
Mitigation strategies must prioritize both technical remediation and network segmentation controls. The primary defense is applying the vendor-provided firmware update that addresses the buffer overflow by implementing proper input validation and length checks within the DHCP blobmsg handler logic. Until patches are available, administrators should isolate these devices in a dedicated VLAN with strict firewall rules limiting inbound traffic to only necessary management protocols from trusted IP ranges. Additionally enabling network-level intrusion detection systems configured to detect anomalous DHCP packet sizes or malformed netifd interactions can provide early warning indicators of exploitation attempts. Regular auditing of firmware versions and disabling unused services on the device further reduce the attack surface, ensuring that even if one vector is exploited, lateral movement remains constrained by robust perimeter defenses.