CVE-2025-12271 is a buffer overflow vulnerability identified in the Tenda CH22 router firmware version 1.0.0.1. The issue is located in the fromRouteStatic function within the /goform/RouteStatic endpoint, where improper validation of the 'page' argument allows an attacker to overflow a buffer. This vulnerability can be exploited remotely without user interaction, and no authentication is required, although the CVSS vector indicates a low privilege requirement, suggesting some prior access or lower-level privilege might be needed. The buffer overflow can lead to memory corruption, enabling an attacker to execute arbitrary code remotely or cause a denial of service by crashing the device. The exploit code is publicly available, increasing the likelihood of exploitation. The vulnerability affects network availability and confidentiality by potentially allowing attackers to take control of the device, intercept traffic, or disrupt network services. No official patches are currently linked, so mitigation may rely on network segmentation and access control until vendor updates are released. The vulnerability is scored 8.7 on CVSS 4.0, reflecting its high impact and exploitability.

For European organizations, the exploitation of CVE-2025-12271 could result in significant disruption of network services, especially for small and medium enterprises or home office setups relying on Tenda CH22 routers. Successful exploitation could allow attackers to gain control over the device, leading to interception or manipulation of network traffic, loss of data confidentiality, and potential lateral movement within corporate networks. Critical infrastructure or organizations with remote sites using these devices could face operational outages or data breaches. The public availability of exploits increases the risk of widespread attacks, including automated scanning and exploitation campaigns. The impact is heightened in environments where patch management is slow or where network perimeter defenses are weak. Additionally, compromised routers could be used as entry points for broader cyber espionage or ransomware campaigns targeting European entities.

1. Immediately restrict external network access to the /goform/RouteStatic endpoint by implementing firewall rules or access control lists to limit exposure to trusted internal networks only. 2. Monitor network traffic for unusual requests targeting the vulnerable endpoint and deploy intrusion detection/prevention systems (IDS/IPS) signatures to detect exploitation attempts. 3. Segment networks to isolate vulnerable devices from critical infrastructure and sensitive data environments. 4. Engage with Tenda support channels to obtain and apply firmware updates or patches as soon as they become available. 5. If patches are not yet available, consider temporary device replacement or disabling remote management features to reduce attack surface. 6. Conduct regular vulnerability assessments and penetration testing focusing on network devices to identify and remediate similar risks. 7. Educate IT staff about this specific vulnerability and the importance of timely patching and network hygiene.