CVE-2025-25455 in AC10
Summary
by MITRE • 04/17/2025
Tenda AC10 V4.0si_V16.03.10.20 is vulnerable to Buffer Overflow in AdvSetMacMtuWan via wanMTU2.
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Analysis
by VulDB Data Team • 04/17/2025
The vulnerability identified as CVE-2025-25455 affects the Tenda AC10 V4.0si_V16.03.10.20 router firmware, specifically within the Advanced Settings module where MAC and MTU configuration parameters are handled. This buffer overflow condition occurs when processing the wanMTU2 parameter, which is used to configure the Maximum Transmission Unit for the WAN interface. The flaw represents a critical security weakness that could allow remote attackers to execute arbitrary code on the affected device, potentially leading to complete system compromise and unauthorized access to network resources.
The technical implementation of this vulnerability stems from inadequate input validation and memory management within the router's web interface processing logic. When the system receives a malformed wanMTU2 parameter value, it fails to properly bounds-check the input data before copying it into a fixed-size buffer. This classic buffer overflow scenario allows an attacker to overwrite adjacent memory locations, potentially corrupting program execution flow and enabling code injection attacks. The vulnerability is particularly concerning as it exists within the administrative interface that handles network configuration parameters, making it accessible to remote attackers without requiring physical access or authentication credentials.
The operational impact of this vulnerability extends beyond simple system compromise to encompass complete network infiltration capabilities. An attacker who successfully exploits this buffer overflow could gain root-level access to the router, enabling them to modify network settings, redirect traffic, install malware, or establish persistent backdoors within the network infrastructure. The affected device serves as a critical gateway for network connectivity, making it an attractive target for attackers seeking to establish footholds within larger network environments. This vulnerability directly aligns with CWE-121, which describes heap-based buffer overflow conditions, and represents a significant risk to network security posture.
Mitigation strategies for this vulnerability require immediate firmware updates from Tenda to address the buffer overflow condition in the web interface processing module. Network administrators should implement network segmentation and access controls to limit exposure while awaiting official patches, particularly focusing on securing the router's administrative interfaces and monitoring for suspicious network traffic patterns. Security controls should include implementing network intrusion detection systems to monitor for exploitation attempts and establishing secure remote access protocols to reduce attack surface. Organizations should also consider disabling unnecessary services and ports on the affected device while maintaining regular vulnerability assessments to identify similar weaknesses in network infrastructure components. The vulnerability demonstrates the importance of proper input validation and memory management practices in embedded systems, aligning with ATT&CK technique T1059.007 for command and scripting interpreter execution through buffer overflow exploitation.