CVE-2020-23590 is a medium-severity vulnerability affecting the Optilink OP-XT71000N router, specifically hardware version V2.2 running firmware OP_V3.3.1-191028. The vulnerability allows an unauthenticated remote attacker to perform a Cross-Site Request Forgery (CSRF) attack targeting the router's web interface, specifically the "wlwpa.asp" page responsible for WLAN SSID password configuration. Through this attack, the adversary can change the password for the wireless network without requiring authentication. The vulnerability arises due to the lack of proper CSRF protections on the router's web management interface, enabling malicious requests to be executed if a user with an active session visits a crafted webpage. The CVSS v3.1 base score is 6.5, reflecting a network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), but requiring user interaction (UI:R). The impact is limited to integrity (I:H) since the attacker can modify the WLAN password, but confidentiality and availability are not directly affected. No known exploits have been reported in the wild, and no official patches or vendor advisories are currently available. The vulnerability is categorized under CWE-352 (Cross-Site Request Forgery). This vulnerability could allow attackers to disrupt wireless network access by changing passwords, potentially locking out legitimate users or enabling further attacks if the attacker gains access to the network after changing credentials.

For European organizations using the Optilink OP-XT71000N router, this vulnerability poses a risk to network integrity and operational continuity. Unauthorized password changes could disrupt wireless connectivity, leading to denial of service for legitimate users and potential operational downtime. In environments where wireless access is critical for business operations, such disruption could impact productivity and service availability. Additionally, if attackers successfully change the WLAN password and gain access, they could pivot within the internal network, potentially accessing sensitive data or launching further attacks. The lack of authentication requirement and low attack complexity increase the risk, especially in organizations where users might be tricked into visiting malicious websites. However, since the vulnerability requires user interaction and affects only a specific router model and firmware version, the overall impact is somewhat contained. The absence of known exploits in the wild reduces immediate risk but does not eliminate the threat, especially if attackers develop exploit techniques leveraging this vulnerability.

Immediately verify if your organization uses the Optilink OP-XT71000N router, hardware version V2.2 with firmware OP_V3.3.1-191028, and identify all instances in your network. If affected, restrict access to the router's web management interface by limiting it to trusted internal networks and disabling remote management over the internet. Implement network segmentation to isolate wireless management interfaces from general user networks to reduce exposure. Educate users about the risks of visiting untrusted websites while connected to the corporate network to mitigate the risk of CSRF attacks requiring user interaction. Monitor network traffic and router logs for unusual configuration changes or access attempts to the web interface. If possible, upgrade to a newer firmware version or router model that includes CSRF protections; if no official patch is available, consider contacting the vendor for guidance or applying community-developed mitigations. Deploy web application firewalls (WAF) or intrusion prevention systems (IPS) that can detect and block CSRF attack patterns targeting router management interfaces. Regularly back up router configurations to enable quick restoration in case of unauthorized changes.