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CVE-2025-61582: Denial of Service Vulnerability in TS3 Manager Due to Improper Unicode Handling

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Overview

The vulnerability CVE-2025-61582 poses a significant threat to TS3 Manager, a web interface for maintaining Teamspeak3 servers. It has been identified that versions 2.2.1 and earlier are susceptible to a Denial of Service attack launched by an unauthenticated actor, which can result in system compromise or data leakage. Given the widespread use of TS3 Manager in maintaining Teamspeak3 servers, it is imperative to understand, detect and mitigate this vulnerability to ensure system stability and data integrity.

Vulnerability Summary

CVE ID: CVE-2025-61582
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage caused by Denial of Service attack

Affected Products

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Product | Affected Versions

TS3 Manager | 2.2.1 and earlier

How the Exploit Works

The vulnerability is exploited by submitting specially crafted Unicode input to the Server field on the login page of the TS3 Manager. The application fails to properly handle these characters during the ASCII conversion process, resulting in an unhandled exception that terminates the application within four to five seconds of submission.

Conceptual Example Code

Here is a conceptual example of how the vulnerability might be exploited through a POST request:

POST /login HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
server=𝕦𝕟𝕚𝕔𝕠𝕕𝕖_𝕚𝕟𝕡𝕦𝕥

Reiteration: This is a conceptual example and not a real-life exploit.

Mitigation and Recommendations

The issue has been fixed in TS3 Manager version 2.2.2. Users are strongly advised to update to this version. If updating is not immediately possible, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation. It’s also recommended to monitor network traffic for any unusual activity, particularly any unusual Unicode submissions.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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