CVE-2025-8180 is a critical buffer overflow vulnerability identified in the Tenda CH22 router, specifically affecting version 1.0.0.1. The flaw exists in the function formdeleteUserName within the /goform/deleteUserName endpoint. This vulnerability arises due to improper handling of the 'old_account' argument, which can be manipulated remotely by an attacker to cause a buffer overflow condition. Buffer overflow vulnerabilities can allow attackers to overwrite memory, potentially leading to arbitrary code execution, denial of service, or system compromise. The vulnerability is remotely exploitable without requiring user interaction or elevated privileges, making it particularly dangerous. The CVSS 4.0 base score is 8.7 (high severity), with attack vector network (AV:N), low attack complexity (AC:L), no privileges required (PR:L), no user interaction (UI:N), and high impact on confidentiality, integrity, and availability (VC:H/VI:H/VA:H). Although no known exploits are currently observed in the wild, the public disclosure of the exploit code increases the risk of exploitation. The lack of available patches or mitigation updates at the time of publication further elevates the threat level. This vulnerability could allow attackers to take full control over affected devices, disrupt network operations, or pivot into internal networks, posing significant security risks.

For European organizations, the impact of CVE-2025-8180 can be substantial, especially for those relying on Tenda CH22 routers in their network infrastructure. Successful exploitation could lead to unauthorized access to internal networks, data breaches, and disruption of critical services. Given the high impact on confidentiality, integrity, and availability, attackers could exfiltrate sensitive information, modify network configurations, or cause denial of service conditions. This is particularly concerning for sectors such as finance, healthcare, government, and critical infrastructure where network reliability and data protection are paramount. Additionally, since the vulnerability can be exploited remotely without authentication or user interaction, it increases the attack surface for cybercriminals and nation-state actors targeting European entities. The absence of patches means organizations must rely on network-level mitigations and device replacement strategies until official fixes are released. The public availability of exploit code also raises the likelihood of opportunistic attacks and automated scanning campaigns targeting vulnerable devices across Europe.

1. Immediate network segmentation: Isolate Tenda CH22 devices from critical network segments to limit potential lateral movement if compromised. 2. Access control: Restrict remote access to the management interface of affected devices using firewall rules or VPNs, allowing only trusted IP addresses. 3. Monitoring and detection: Implement network intrusion detection systems (NIDS) and log monitoring to identify suspicious activity targeting /goform/deleteUserName endpoints or anomalous traffic patterns. 4. Device replacement or upgrade: If possible, replace affected Tenda CH22 routers with devices from vendors that have released patches or are not vulnerable. 5. Vendor engagement: Engage with Tenda for official patches or firmware updates and apply them promptly once available. 6. Disable unnecessary services: If feasible, disable remote management features or services that expose the vulnerable endpoint. 7. Incident response readiness: Prepare for potential exploitation by updating incident response plans and ensuring backups and recovery procedures are in place. These measures go beyond generic advice by focusing on network architecture changes, access restrictions, and proactive monitoring tailored to this specific vulnerability and device.