CVE-2026-4392

MEDIUM

TeamSpeak 3 Server clientek Handshake assertion

Title source: cna
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2026-4392. PoCs published by born0monday.

AI-analyzed exploit summary This repository contains functional exploit code for CVE-2026-4392, targeting TeamSpeak 3.13.7 with a Denial-of-Service (DoS) attack. The PoC implements a crafted handshake and packet manipulation to trigger a crash in the TeamSpeak server.

Description

A vulnerability was detected in TeamSpeak 3 Server up to 3.13.7. This issue affects some unknown processing of the component clientek Handshake Handler. Performing a manipulation of the argument proof results in reachable assertion. Remote exploitation of the attack is possible. Upgrading to version 3.13.8 is capable of addressing this issue. Upgrading the affected component is recommended.

Exploits (1)

github WORKING POC
by born0monday · rustpoc
https://github.com/born0monday/teamspeak3-vulnerabilities

This repository contains functional exploit code for CVE-2026-4392, targeting TeamSpeak 3.13.7 with a Denial-of-Service (DoS) attack. The PoC implements a crafted handshake and packet manipulation to trigger a crash in the TeamSpeak server.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: TeamSpeak 3.13.7
No auth needed
Prerequisites: network access to the TeamSpeak server
devstral-2 · analyzed Jun 03, 2026 Full analysis →

References (5)

Core 5
Core References
Vdb Entry, Technical Description vdb-entry technical-description
VDB-366316 | TeamSpeak 3 Server clientek Handshake assertion
https://vuldb.com/vuln/366316
Signature, Permissions Required signature permissions-required
VDB-366316 | CTI Indicators (IOB, IOC, IOA)
https://vuldb.com/vuln/366316/cti

Scores

CVSS v3 5.3
EPSS 0.0006
EPSS Percentile 17.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-617
Status published
Products (9)
None/TeamSpeak 3 Server 3.13.0
None/TeamSpeak 3 Server 3.13.1
None/TeamSpeak 3 Server 3.13.2
None/TeamSpeak 3 Server 3.13.3
None/TeamSpeak 3 Server 3.13.4
None/TeamSpeak 3 Server 3.13.5
None/TeamSpeak 3 Server 3.13.6
None/TeamSpeak 3 Server 3.13.7
None/TeamSpeak 3 Server 3.13.8
Published May 27, 2026
Tracked Since May 27, 2026