CVE-2026-10132 in Totolink
Summary
by MITRE • 10/20/2026
A stack-based buffer overflow vulnerability exists in the boa formIpQos mac functionality of X2000R (version(s): TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327). A specially crafted HTTP request can lead to arbitrary code execution. An attacker can make an authenticated HTTP request to trigger this vulnerability.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 10/20/2026
The identified vulnerability represents a critical security flaw within the embedded web server software, specifically Boa, utilized in the TOTOLINK X2000R router running version 1.0.0-B20250421.1327. This stack-based buffer overflow occurs during the processing of HTTP requests directed at the mac functionality associated with formIpQos. The root cause lies in insufficient boundary checking when handling input data for this specific configuration parameter, allowing an attacker to write beyond the allocated memory space on the call stack. Such vulnerabilities are classically categorized under CWE-121, which denotes a stack-based buffer overflow where user-controlled input exceeds the fixed-size buffer's capacity, leading to corruption of adjacent memory structures including return addresses and saved frame pointers.
The operational impact of this vulnerability is severe due to its potential for arbitrary code execution. By crafting a malicious HTTP request with carefully constructed payload data, an authenticated attacker can overwrite critical stack metadata. This manipulation allows the attacker to redirect program flow to shellcode injected into the buffer or existing executable memory regions within the router's firmware. Since the Boa web server typically runs with elevated privileges on embedded Linux systems, successful exploitation grants the attacker full control over the device. This level of access enables a wide range of malicious activities including network pivoting for lateral movement across internal networks, installation of persistent backdoors, interception and modification of unencrypted traffic, and use of the compromised router as part of a botnet infrastructure such as Mirai variants targeting IoT devices.
From an attack perspective, this vulnerability aligns with MITRE ATT&CK techniques related to initial access via web applications and subsequent privilege escalation or command execution on remote systems. The requirement for authentication does not mitigate the risk significantly in many enterprise environments where default credentials are often left unchanged or shared among users, effectively lowering the barrier to entry for exploitation. Furthermore, because this is a network-facing service accessible over HTTP, it presents an attractive target for automated scanning tools that probe for known vulnerable firmware versions and exploit patterns associated with embedded web servers like Boa.
Mitigation strategies must prioritize immediate patching if a vendor-provided update addressing this specific buffer overflow in the formIpQos module is available. In cases where patches are not immediately accessible, network-level controls should be implemented to restrict access to the router's management interface exclusively from trusted IP addresses or administrative subnets. Additionally, enabling HTTPS and disabling unnecessary HTTP services can reduce the attack surface by preventing unencrypted interactions that might expose sensitive configuration data during exploitation attempts. For long-term resilience, organizations should conduct regular firmware audits across their IoT infrastructure and replace devices with known vulnerabilities once they reach end-of-life status to prevent prolonged exposure to such critical exploits.