CVE-2025-9007 is a high-severity buffer overflow vulnerability identified in the Tenda CH22 router, specifically affecting version 1.0.0.1. The flaw resides in the function formeditFileName within the /goform/editFileName endpoint. This vulnerability allows an attacker to remotely send crafted requests that overflow the buffer, potentially overwriting adjacent memory. Given the nature of buffer overflows, exploitation could lead to arbitrary code execution, denial of service, or system crashes. The vulnerability is remotely exploitable without user interaction and requires low attack complexity, but it does require low privileges (likely authenticated access or some form of network access to the device's management interface). The CVSS 4.0 score is 8.7, indicating a high severity with high impact on confidentiality, integrity, and availability. Although no public exploits are currently known to be actively used in the wild, the exploit code has been publicly disclosed, increasing the risk of future exploitation. The lack of available patches at the time of publication further elevates the threat. The Tenda CH22 is a consumer and small office/home office (SOHO) router, and vulnerabilities in such devices can be leveraged to gain footholds in networks or disrupt internet connectivity. The vulnerability does not require user interaction, making it more dangerous in automated attack scenarios.

For European organizations, the impact of CVE-2025-9007 can be significant, especially for small and medium enterprises (SMEs) and home office users relying on Tenda CH22 routers. Successful exploitation could lead to unauthorized control over network traffic, interception of sensitive data, or disruption of internet access. This can compromise confidentiality by exposing internal communications, integrity by allowing manipulation of data flows, and availability by causing device crashes or network outages. In sectors such as finance, healthcare, and critical infrastructure, even small network disruptions or data breaches can have cascading effects. Additionally, compromised routers can be used as entry points for lateral movement within corporate networks or as part of botnets for larger scale attacks. The public disclosure of exploit code increases the urgency for European organizations to assess their exposure and implement mitigations promptly. The lack of patches means organizations must rely on network-level controls and device replacement or isolation until a vendor fix is available.

1. Immediate network segmentation: Isolate Tenda CH22 devices from critical network segments to limit potential lateral movement if compromised. 2. Disable remote management interfaces or restrict access to trusted IP addresses only, reducing the attack surface. 3. Monitor network traffic for unusual activity originating from or targeting Tenda CH22 devices, including unexpected outbound connections or malformed packets. 4. Employ intrusion detection/prevention systems (IDS/IPS) with updated signatures to detect attempts to exploit this buffer overflow. 5. Where possible, replace affected Tenda CH22 routers with devices from vendors with active security support and patch availability. 6. Regularly audit and inventory network devices to identify vulnerable Tenda CH22 routers. 7. Apply strict access control policies and enforce strong authentication mechanisms on router management interfaces. 8. Stay updated with vendor announcements for patches or firmware updates addressing this vulnerability and apply them promptly once available. 9. Educate users and administrators about the risks and signs of compromise related to router vulnerabilities.