CVE-2025-32010 is a high-severity stack-based buffer overflow vulnerability identified in the Cloud API functionality of the Tenda AC6 V5.0 router, specifically version V02.03.01.110. This vulnerability arises due to improper handling of data within the Cloud API's HTTP response processing, where a specially crafted HTTP response can overflow a stack buffer. Exploiting this flaw allows an unauthenticated remote attacker to execute arbitrary code on the affected device without requiring any user interaction. The vulnerability is classified under CWE-121, indicating a classic stack-based buffer overflow, which can lead to complete compromise of the device's confidentiality, integrity, and availability. The CVSS v3.1 base score of 8.1 reflects the critical nature of this vulnerability, with attack vector being network-based (AV:N), high attack complexity (AC:H), no privileges required (PR:N), and no user interaction needed (UI:N). The scope is unchanged (S:U), and the impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H). Although no known exploits are currently reported in the wild, the vulnerability's characteristics make it a prime candidate for exploitation once a proof-of-concept or exploit code becomes publicly available. The lack of available patches at the time of publication further increases the risk to users of the affected firmware version. This vulnerability affects the Tenda AC6 V5.0 router, a consumer-grade networking device commonly used to provide wireless internet access, which often serves as a gateway between internal networks and the internet, making it a critical point of security enforcement.

For European organizations, the exploitation of CVE-2025-32010 could have severe consequences. Compromise of Tenda AC6 routers could allow attackers to gain persistent remote code execution on network gateways, enabling interception, modification, or disruption of network traffic. This could lead to data breaches involving sensitive personal or corporate information, violating GDPR and other data protection regulations. Additionally, attackers could use compromised routers as footholds for lateral movement within corporate networks or as launchpads for further attacks such as man-in-the-middle, DNS hijacking, or distributed denial-of-service (DDoS) attacks. The high impact on confidentiality, integrity, and availability means that critical business operations relying on network connectivity could be disrupted, causing financial losses and reputational damage. Small and medium enterprises (SMEs) and home offices using Tenda AC6 devices are particularly at risk due to potentially limited IT security resources and delayed patching. The absence of known exploits currently provides a window for proactive mitigation, but the high severity score indicates urgency in addressing this vulnerability to prevent future exploitation.

European organizations and users of Tenda AC6 V5.0 routers should immediately verify their device firmware version and avoid using version V02.03.01.110. Since no official patches are currently available, organizations should consider the following specific mitigations: 1) Disable the Cloud API functionality on affected devices if possible, to eliminate the attack surface related to this vulnerability. 2) Restrict network access to the router's management interfaces and Cloud API endpoints by implementing firewall rules that limit inbound connections to trusted IP addresses only. 3) Monitor network traffic for unusual HTTP responses or unexpected outbound connections from the router that could indicate exploitation attempts. 4) Where feasible, replace affected Tenda AC6 devices with alternative models or vendors that have patched this vulnerability or are not affected. 5) Maintain rigorous network segmentation to limit the impact of a compromised router, ensuring critical systems are isolated from devices with known vulnerabilities. 6) Stay informed on vendor advisories for firmware updates addressing this vulnerability and apply patches promptly once released. 7) Conduct regular security audits and vulnerability scans to detect outdated firmware and vulnerable devices within the network infrastructure.