CVE-2026-28763 in Totolink
Summary
by MITRE • 10/21/2026
A stack-based buffer overflow vulnerability exists in the boa formMapDelDevice hostname 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.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability represents a critical stack-based buffer overflow within the boa web server implementation, specifically targeting the formMapDelDevice hostname processing functionality in TOTOLINK-X2000R firmware versions prior to or including V1.0.0-B20250421.1327. This flaw stems from improper bounds checking when handling user-supplied input for device deletion operations, allowing an attacker to overwrite adjacent memory locations on the call stack with maliciously crafted data. The vulnerability is classified under CWE-121, which denotes a stack-based buffer overflow where local variables are exceeded by incoming data without adequate validation or length verification mechanisms in place within the application logic.
From an operational perspective, this defect enables remote code execution provided that the attacker possesses valid authentication credentials for the device management interface. The requirement for prior authentication significantly narrows the attack surface compared to unauthenticated exploits but does not mitigate the severity of the outcome once access is granted. An authenticated adversary can construct a specially formatted HTTP request containing an oversized hostname string, which triggers the buffer overflow during parsing and processing by the boa server component. This memory corruption allows for precise control over execution flow, potentially leading to arbitrary code execution with the privileges of the web service process, typically root or equivalent high-level system access on embedded Linux devices.
The exploitation path aligns closely with MITRE ATT&CK technique T1059, Command and Scripting Interpreter, as well as T1203, Exploitation for Client Execution, depending on how the payload is delivered post-exploitation. The initial foothold gained through this buffer overflow can serve as a pivot point for further lateral movement within the local network segment where the router resides. Given that routers often act as gateways to internal networks, successful exploitation could compromise not only the device itself but also expose sensitive traffic and connected endpoints to interception or manipulation.
Mitigation strategies should prioritize immediate firmware updates if an official patch is available from TOTOLINK for the specified model and version range. In environments where updating is not immediately feasible, network segmentation can help isolate vulnerable devices from critical internal resources. Additionally, enforcing strict access controls on the management interface, such as restricting administrative login attempts to specific trusted IP addresses via firewall rules or ACLs, reduces the likelihood of successful exploitation by limiting exposure to potential attackers who might obtain valid credentials through other means like phishing or credential stuffing attacks. Regular auditing of firmware versions and prompt application of security patches remain essential practices for maintaining robust network infrastructure integrity against such memory corruption vulnerabilities.