CVE-2025-32010 is a stack-based buffer overflow vulnerability identified in the Cloud API functionality of the Tenda AC6 V5.0 router, specifically version V02.03.01.110. The vulnerability arises when the device processes an HTTP response that is specially crafted to overflow a stack buffer, which can corrupt memory and allow an attacker to execute arbitrary code remotely. The attack vector is network-based (AV:N), requiring no privileges (PR:N) or user interaction (UI:N), but with high attack complexity (AC:H), indicating some non-trivial conditions must be met to exploit it. Successful exploitation compromises confidentiality, integrity, and availability (all rated high), potentially allowing attackers to take full control of the device. The vulnerability is categorized under CWE-121, a classic stack-based buffer overflow issue. Although no public exploits are currently known, the severity and nature of the flaw make it a critical concern for affected users. The Tenda AC6 V5.0 is a widely deployed consumer and small business router, often used for internet connectivity and network management, making this vulnerability a significant risk for network security. The lack of available patches at the time of publication increases the urgency for mitigation and monitoring.

For European organizations, exploitation of this vulnerability could lead to complete compromise of affected Tenda AC6 V5.0 routers, enabling attackers to intercept, modify, or disrupt network traffic, potentially leading to data breaches, espionage, or denial of service. This is particularly critical for small and medium enterprises and home office environments relying on these routers for secure internet access. The arbitrary code execution capability could allow attackers to pivot into internal networks, compromising additional systems and sensitive data. Critical infrastructure sectors using these devices for connectivity may face operational disruptions. The high confidentiality, integrity, and availability impact means that sensitive communications and business operations could be severely affected. The absence of known exploits currently provides a window for proactive defense, but the network-exposed nature of the vulnerability means rapid exploitation is possible once exploit code becomes available.

1. Immediately assess and inventory all Tenda AC6 V5.0 routers running version V02.03.01.110 within the network. 2. Disable the Cloud API functionality if it is not essential to reduce the attack surface. 3. Implement network segmentation to isolate vulnerable routers from critical internal systems. 4. Deploy strict firewall rules to block unsolicited inbound HTTP responses from untrusted sources. 5. Monitor network traffic for anomalous HTTP responses or signs of exploitation attempts. 6. Engage with Tenda support or vendor channels to obtain patches or firmware updates as soon as they become available. 7. Consider replacing vulnerable devices with models that have received security updates if patching is delayed. 8. Educate network administrators about this vulnerability and ensure incident response plans include this threat. 9. Use intrusion detection/prevention systems (IDS/IPS) with updated signatures to detect exploitation attempts. 10. Regularly review and update router configurations to follow security best practices.