CVE-2025-69764 in AX3
Summary
by MITRE • 01/22/2026
Tenda AX3 firmware v16.03.12.11 contains a stack-based buffer overflow in the formGetIptv function due to improper handling of the stbpvid stack buffer, which may result in memory corruption and remote code execution.
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Analysis
by VulDB Data Team • 01/22/2026
The vulnerability identified as CVE-2025-69764 represents a critical stack-based buffer overflow within the Tenda AX3 wireless router firmware version 16.03.12.11. This flaw manifests in the formGetIptv function where inadequate input validation and memory management practices create conditions for malicious actors to exploit the device's memory structure. The specific issue occurs when processing the stbpvid stack buffer, which serves as an intermediary storage element for IPTV configuration parameters. The improper handling of this buffer allows attackers to exceed its allocated memory boundaries and overwrite adjacent stack memory locations.
The technical implementation of this vulnerability stems from a fundamental flaw in the firmware's memory management protocols where the stbpvid buffer lacks proper bounds checking mechanisms. When the formGetIptv function processes incoming data containing IPTV parameters, it fails to validate the length of input data against the predetermined buffer size. This oversight creates a classic stack overflow condition where attacker-controlled data can overwrite return addresses, function pointers, and other critical stack variables. The vulnerability operates at the application layer and requires no authentication for exploitation, making it particularly dangerous in networked environments where routers are exposed to external threats. The flaw aligns with CWE-121 Stack-based Buffer Overflow, which specifically addresses buffer overflows occurring in stack memory regions.
The operational impact of this vulnerability extends beyond simple memory corruption, potentially enabling remote code execution on affected devices. An attacker who successfully exploits this vulnerability can gain unauthorized access to the router's operating system and execute arbitrary code with the privileges of the affected process. This capability allows for complete compromise of the device, enabling attackers to modify network configurations, intercept traffic, establish persistent backdoors, or use the compromised router as a pivot point for attacking other devices within the local network. The remote nature of the exploit means that attackers can target vulnerable devices from outside the network perimeter, making the attack surface significantly larger than typical local network vulnerabilities. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1059 Command and Scripting Interpreter and T1021 Remote Services, as it enables remote code execution and network service manipulation.
Mitigation strategies for CVE-2025-69764 require immediate action from network administrators and device owners. The primary recommendation involves updating to the latest firmware version provided by Tenda, which should contain patches addressing the buffer overflow condition in the formGetIptv function. Network segmentation and firewall rules should be implemented to restrict access to router management interfaces from untrusted networks, particularly blocking access to port 80 and other common web interface ports. Regular network monitoring should be employed to detect unusual traffic patterns or unauthorized access attempts that may indicate exploitation attempts. Additionally, network administrators should implement intrusion detection systems that can identify potential exploitation attempts targeting this specific vulnerability. The vulnerability highlights the importance of firmware security updates and proper input validation practices in embedded systems, emphasizing the need for robust security testing during the development lifecycle to prevent similar issues in future releases. Organizations should also consider implementing network access control measures and regular vulnerability assessments to identify other potential weaknesses in their network infrastructure.