CVE-2025-6559 in BR071n
Summary
by MITRE • 06/24/2025
Multiple wireless router models from Sapido have an OS Command Injection vulnerability, allowing unauthenticated remote attackers to inject arbitrary OS commands and execute them on the server. The affected models are out of support; replacing the device is recommended.
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Analysis
by VulDB Data Team • 06/27/2025
The vulnerability identified as CVE-2025-6559 represents a critical operating system command injection flaw affecting multiple wireless router models from the Sapido brand. This security weakness resides within the network infrastructure devices that serve as primary gateways for wireless connectivity in both residential and small office environments. The flaw enables unauthenticated remote attackers to execute arbitrary operating system commands directly on the affected routers, effectively compromising the device's integrity and potentially exposing the entire network to further exploitation. The vulnerability impacts a range of Sapido router models that are no longer receiving official support or security updates from the vendor, leaving users exposed to persistent threats without remediation options.
The technical implementation of this command injection vulnerability stems from inadequate input validation and sanitization within the router's web interface or management protocols. Attackers can exploit this weakness by crafting malicious payloads that bypass authentication mechanisms and inject OS commands through vulnerable input fields or parameters. The lack of proper parameter validation allows attackers to append or prepend command sequences that execute with the privileges of the router's operating system, typically running with elevated permissions to manage network services and configurations. This type of vulnerability falls under the Common Weakness Enumeration category CWE-77, which specifically addresses command injection flaws in software systems. The attack surface is particularly concerning given that these routers operate as network gateways, providing attackers with potential access to internal network resources and the ability to perform man-in-the-middle attacks or redirect network traffic.
The operational impact of CVE-2025-6559 extends beyond simple unauthorized command execution, as it fundamentally undermines network security posture for organizations and individuals using affected Sapido devices. Once compromised, these routers can be used to establish persistent backdoors, redirect traffic to malicious servers, or serve as launching points for attacks against other networked devices. The vulnerability's remote exploitability means attackers do not require physical access or network credentials to compromise the device, making it particularly dangerous for environments where physical security is not strictly controlled. Network administrators face significant challenges in detecting such compromises, as the injected commands may not generate obvious audit trails, and the compromised device could continue to appear operational while serving malicious purposes. According to the MITRE ATT&CK framework, this vulnerability maps to techniques involving command and control communications and privilege escalation, enabling attackers to maintain persistent access and expand their foothold within the network infrastructure.
Given that the affected Sapido router models are out of vendor support, traditional remediation approaches such as firmware updates are unavailable to address this vulnerability. The recommended mitigation strategy centers on immediate device replacement with supported models from vendors that provide ongoing security maintenance and support. Organizations should conduct comprehensive network assessments to identify all instances of affected Sapido routers and implement network segmentation to limit the potential impact of any compromise. Network monitoring solutions should be enhanced to detect unusual traffic patterns or command execution indicators that might signal exploitation attempts. Security teams should also consider implementing network access controls and firewall rules to restrict communication between the compromised router and external threat infrastructure. The vulnerability highlights the importance of maintaining up-to-date network equipment and the risks associated with using legacy devices that no longer receive security patches or vendor support, emphasizing the need for regular network inventory audits and proactive replacement schedules.