CVE-2026-37152 in X5000R
Summary
by MITRE • 09/15/2026
TOTOLINK X5000R V9.1.0cu.2415_B20250515 was discovered to contain a hardcoded password for root access.
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Analysis
by VulDB Data Team • 09/15/2026
The discovery of a hardcoded password within the TOTOLINK X5000R router, specifically in firmware version V9.1.0cu.2415_B20250515, represents a critical failure in secure software development practices that fundamentally compromises the integrity and confidentiality of network infrastructure devices. This vulnerability falls squarely under the category of CWE-798: Use of Hard-coded Credentials, which is consistently ranked among the most severe security risks due to its direct impact on authentication mechanisms. When manufacturers embed static credentials directly into the firmware image rather than generating unique keys or passwords during device initialization or allowing user configuration, they create a single point of failure that affects every unit produced with that specific build. This practice violates fundamental principles of defense in depth and secure by design, as it removes the ability for administrators to establish strong, unique access controls tailored to their specific security requirements.
From an operational perspective, this flaw allows any attacker who gains network visibility or physical access to bypass authentication mechanisms entirely. By utilizing the known hardcoded root credentials, a malicious actor can gain full administrative control over the router without needing to exploit additional software bugs or perform complex cracking attacks against password hashes. This level of access is particularly dangerous because it grants unrestricted read and write permissions to the device's configuration files, system logs, and potentially sensitive data passing through the network interface. The attacker can modify routing tables, redirect traffic to malicious servers for man-in-the-middle attacks, disable logging features to cover their tracks, or install persistent backdoors that survive firmware updates if not properly sanitized.
The implications of this vulnerability extend beyond simple unauthorized access, impacting broader industry standards and threat models such as the MITRE ATT&CK framework. Specifically, this flaw facilitates Initial Access through valid accounts (T1078) and enables Privilege Escalation to system-level privileges (T1068). Once inside, an attacker can leverage these credentials for lateral movement within a local network or exfiltrate sensitive information such as Wi-Fi passwords stored in the configuration database. The presence of hardcoded root access significantly lowers the barrier to entry for automated scanning tools and script-kiddie attacks, making devices with this firmware version high-value targets for botnet recruitment campaigns like Mirai variants that seek to compromise IoT devices for distributed denial-of-service operations.
Mitigation strategies must address both immediate remediation and long-term security posture improvements. The primary corrective action is to update the router firmware immediately if TOTOLINK has released a patched version that removes or randomizes these hardcoded credentials. If no patch is available, administrators should isolate the device on a segregated network segment with strict firewall rules limiting inbound access to only necessary management ports from trusted IP addresses. Additionally, changing any configurable passwords and disabling remote administration features can reduce the attack surface while waiting for vendor intervention. For organizations managing multiple such devices, implementing automated vulnerability scanning solutions that specifically check for known hardcoded credential patterns in IoT firmware images is essential for ongoing risk assessment. Ultimately, this incident highlights the critical need for vendors to adopt secure development lifecycles that include static application security testing and regular third-party audits to prevent hardcoding secrets from reaching production environments.