CVE-2025-61582 is a high-severity Denial of Service (DoS) vulnerability affecting the ts3-manager web interface, a tool used to manage Teamspeak3 servers. The vulnerability exists in versions prior to 2.2.2 and stems from improper input validation (CWE-20) when processing Unicode input on the login page. Specifically, the issue arises when an unauthenticated attacker submits specially crafted Unicode tag characters to the Server field. During the ASCII conversion process, the application fails to handle these characters correctly, triggering an unhandled exception that crashes the application within approximately four to five seconds. This flaw requires no authentication or privileges, making exploitation straightforward and accessible to any remote attacker. The vulnerability impacts availability by terminating the ts3-manager service, potentially disrupting administrative access to Teamspeak3 servers. The vendor has addressed this issue in version 2.2.2, which properly validates and handles Unicode input to prevent the crash. No known exploits are currently reported in the wild, but the low complexity and lack of required privileges increase the risk of exploitation.

For European organizations relying on Teamspeak3 servers managed via ts3-manager, this vulnerability poses a significant risk to service availability. Teamspeak3 is widely used for voice communication in gaming, corporate, and community environments. A successful DoS attack could disrupt communication channels critical for operations, collaboration, or customer engagement. This is particularly impactful for sectors such as gaming companies, esports organizations, educational institutions, and remote work environments that depend on stable voice communication platforms. The unauthenticated nature of the attack means that threat actors can cause outages without insider access, increasing the threat landscape. Additionally, repeated exploitation could lead to reputational damage and operational downtime. While confidentiality and integrity are not directly affected, the availability impact alone can cause substantial operational and financial harm.

European organizations should immediately upgrade ts3-manager to version 2.2.2 or later to remediate this vulnerability. Until the upgrade is applied, organizations can implement input validation filters at the web application firewall (WAF) or reverse proxy level to block Unicode tag characters or suspicious Unicode input targeting the Server field. Monitoring and alerting on application crashes or unusual login page activity can help detect exploitation attempts early. Network segmentation and limiting access to the ts3-manager interface to trusted IP addresses can reduce exposure. Additionally, organizations should review and harden their incident response procedures to quickly recover from potential DoS incidents. Regularly auditing and updating third-party management tools like ts3-manager is critical to maintaining security posture.