CVE-2022-45640 is a high-severity vulnerability identified in the Tenda AC6 V1.0 router firmware version 15.03.05.19. The vulnerability is classified as a buffer overflow (CWE-787), which occurs when the software writes more data to a buffer than it can hold, potentially overwriting adjacent memory. This specific buffer overflow leads to a denial of service (DoS) condition that can be triggered locally, causing the device to crash or become unresponsive. According to the CVSS v3.1 vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), the attack can be performed remotely over the network without any privileges or user interaction, making exploitation relatively straightforward. The vulnerability impacts the availability of the device but does not affect confidentiality or integrity. There are no known public exploits in the wild, and no patches or vendor advisories have been linked to this vulnerability yet. The lack of detailed product information beyond the Tenda AC6 V1.0 router model limits the scope of affected devices, but given the nature of consumer-grade routers, this vulnerability could be leveraged to disrupt network connectivity for affected users or organizations.

For European organizations, the primary impact of this vulnerability is the potential disruption of network services due to denial of service on Tenda AC6 routers. This could affect small and medium-sized enterprises (SMEs) or home office environments that rely on this router model for internet connectivity. The loss of availability could interrupt business operations, remote work, and access to cloud services. While the vulnerability does not compromise data confidentiality or integrity, the resulting network downtime could lead to productivity losses and potential secondary impacts such as failure of security monitoring or remote access systems. Organizations with limited IT support or those using these routers in critical infrastructure segments may face increased risk. Additionally, the ease of remote exploitation without authentication or user interaction raises concerns about automated attacks targeting vulnerable devices to cause widespread outages or to be used as part of larger denial-of-service campaigns.

Given the absence of an official patch, organizations should implement the following specific mitigations: 1) Identify and inventory all Tenda AC6 V1.0 routers running firmware version 15.03.05.19 within the network. 2) Restrict remote management access to these devices by disabling WAN-side administration interfaces or limiting access via firewall rules to trusted IP addresses only. 3) Segment networks to isolate vulnerable routers from critical systems and sensitive data to reduce potential impact. 4) Monitor network traffic for unusual patterns that may indicate exploitation attempts, such as repeated connection attempts or device crashes. 5) Where possible, replace affected routers with models from vendors that provide timely security updates and have a strong security track record. 6) Engage with Tenda support channels to request firmware updates or advisories and subscribe to vulnerability notification services for future patches. 7) Implement network-level protections such as intrusion prevention systems (IPS) that can detect and block exploit attempts targeting buffer overflow vulnerabilities.