CVE-2025-28221 in W6_S
Summary
by MITRE • 03/28/2025
Tenda W6_S v1.0.0.4_510 has a Buffer Overflow vulnerability in the set_local_time function, which allows remote attackers to cause web server crash via parameter time passed to the binary through a POST request.
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Analysis
by VulDB Data Team • 03/28/2025
The vulnerability identified as CVE-2025-28221 affects the Tenda W6_S v1.0.0.4_510 wireless router firmware, presenting a critical buffer overflow condition within the set_local_time function. This flaw resides in the web server component that processes time parameters submitted through POST requests, creating an avenue for remote exploitation that can lead to service disruption and potential system compromise. The vulnerability manifests when the web server fails to properly validate or limit the length of the time parameter before processing it, allowing attackers to supply excessive input that overflows the allocated buffer space.
The technical implementation of this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The set_local_time function appears to use a fixed-size buffer to store the time parameter without adequate input validation, making it susceptible to overflow attacks that can corrupt program execution flow. When a maliciously crafted POST request containing an oversized time parameter is submitted to the affected web server, the buffer overflow can overwrite critical memory segments including return addresses, function pointers, or other control data structures.
From an operational perspective, this vulnerability presents significant risk to network infrastructure security as it enables remote code execution capabilities through denial of service attacks. The impact extends beyond simple service disruption since buffer overflows in web server components can potentially allow attackers to inject malicious code or manipulate system behavior. Network administrators face the challenge of securing internet-facing routers without immediate patch availability, as the vulnerability affects firmware versions that may not receive regular updates. The attack surface is particularly concerning for enterprise networks where wireless access points serve as critical infrastructure components.
Security professionals should implement immediate mitigations including network segmentation to isolate affected devices, firewall rules to restrict access to the web management interface, and monitoring for suspicious POST requests containing malformed time parameters. The vulnerability demonstrates the importance of input validation and secure coding practices as outlined in the OWASP Top Ten and MITRE ATT&CK framework, specifically addressing techniques related to command injection and buffer overflow exploitation. Organizations should prioritize firmware updates from Tenda once available and consider implementing intrusion detection systems to identify exploitation attempts targeting this specific vulnerability. The incident underscores the need for regular security assessments of network infrastructure components and highlights the critical importance of maintaining current firmware versions to protect against known vulnerabilities.