CVE-2025-63206 is a critical authentication bypass vulnerability affecting the web-based management interface of the Dasan Switch DS2924, specifically firmware versions 1.01.18 and 1.02.00. The vulnerability arises from improper validation of authentication cookies, allowing an attacker to craft and store malicious cookies in a victim's web browser. When the victim accesses the switch's web interface, these crafted cookies bypass normal authentication checks, granting the attacker escalated privileges without requiring any authentication or user interaction. This flaw is categorized under CWE-306 (Missing Authentication for Critical Function), indicating a fundamental security control failure. The vulnerability's CVSS v3.1 score is 9.8, reflecting its critical nature with network attack vector, low attack complexity, no privileges required, no user interaction, and full impact on confidentiality, integrity, and availability. Although no patches have been released yet and no exploits are known in the wild, the potential for attackers to gain full control over network switches poses a severe risk. Compromising these switches could allow attackers to manipulate network traffic, intercept sensitive data, disrupt network availability, or pivot to other internal systems. The Dasan Switch DS2924 is typically deployed in enterprise and service provider networks, making this vulnerability particularly concerning for organizations relying on these devices for critical network infrastructure management.

For European organizations, exploitation of CVE-2025-63206 could lead to complete compromise of network switch management, enabling attackers to intercept, modify, or disrupt network traffic. This threatens confidentiality by exposing sensitive communications, integrity by allowing unauthorized configuration changes, and availability by potentially disabling network segments. Critical infrastructure sectors such as telecommunications, finance, energy, and government networks that use Dasan switches are at heightened risk. The ability to bypass authentication without user interaction or privileges increases the likelihood of successful attacks, potentially leading to widespread network outages or data breaches. Additionally, attackers could leverage compromised switches as footholds for lateral movement within corporate or national networks, amplifying the impact. The lack of available patches means organizations must rely on compensating controls to mitigate risk until a fix is released.

1. Immediately restrict access to the Dasan Switch DS2924 management interface by implementing strict network segmentation and firewall rules, allowing only trusted administrative hosts to connect. 2. Disable web-based management interfaces if possible, or replace them with secure out-of-band management solutions. 3. Monitor network traffic and logs for unusual cookie values or unauthorized access attempts to the switch's web interface. 4. Employ web application firewalls (WAFs) or intrusion detection/prevention systems (IDS/IPS) to detect and block suspicious HTTP requests targeting the switch. 5. Enforce multi-factor authentication (MFA) on management interfaces if supported to add an additional layer of security. 6. Maintain an inventory of affected devices and track firmware versions to prioritize patching once updates become available. 7. Educate network administrators about the vulnerability and the risks of using default or weak authentication mechanisms. 8. Collaborate with Dasan Networks or vendors to obtain timely security updates and apply patches as soon as they are released.