CVE-2026-51642 in TOTOLINK
Summary
by MITRE • 08/28/2026
Incorrect access control in the getMeshRoutingTable function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain mesh routing information via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
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Analysis
by VulDB Data Team • 08/28/2026
The vulnerability identified in the getMeshRoutingTable function within TOTOLINK T6 firmware version 4.1.5cu.748_B20211015 represents a critical failure in access control mechanisms, specifically classified under CWE-284: Improper Access Control. This flaw allows unauthenticated remote attackers to retrieve sensitive mesh routing information by submitting a crafted POST request to the /cgi-bin/cstecgi.cgi endpoint. The core technical issue lies in the absence of proper authentication checks or session validation before processing requests directed at this specific function, enabling any network user with connectivity to the device's management interface to extract internal topology data without valid credentials.
From an operational perspective, the exposure of mesh routing information poses significant security risks beyond simple unauthorized access. Mesh networks rely on dynamic path selection and node coordination to maintain connectivity; revealing the underlying routing table allows attackers to map the entire network structure, including gateway locations, intermediate nodes, and potential choke points. This intelligence can be leveraged for subsequent attacks such as traffic interception, denial of service by targeting critical relay nodes, or man-in-the-middle attacks where an attacker positions themselves strategically within the mesh topology to intercept sensitive data flows. The ability to enumerate these routes effectively compromises the confidentiality and integrity of the network infrastructure.
This vulnerability aligns with MITRE ATT&CK technique T1046: Network Service Discovery, as it facilitates reconnaissance by exposing internal network architecture details that are typically hidden from external or unauthenticated users. Furthermore, it reflects CWE-862: Missing Authorization, where the software fails to enforce proper access controls on a resource protected by an authentication mechanism for other functions but neglects this requirement for specific endpoints like getMeshRoutingTable. The exploitation vector is remote and requires no prior authentication, significantly lowering the barrier for entry and increasing the likelihood of automated scanning and exploitation in targeted environments.
Mitigation strategies should prioritize immediate patching to the latest firmware version released by TOTOLINK that addresses this access control flaw. In cases where updating is not immediately feasible, administrators can implement network-level controls such as restricting access to the management interface via IP whitelisting or placing it behind a secure administrative portal with strong authentication requirements. Additionally, deploying intrusion detection systems configured to monitor for suspicious POST requests targeting /cgi-bin/cstecgi.cgi can help detect and block exploitation attempts in real-time. Regular security audits of embedded web interfaces are essential to ensure that all CGI endpoints enforce consistent authorization policies across the entire application surface area.