TeamSpeak 3 Server clientek Handshake assertion

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-4392
StatePUBLISHED
AssignerVulDB
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 18:16:28 UTC
Updated2026-05-27 19:49:48 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v4.0 6.9 MEDIUM from [email protected]

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.000420000 probability, percentile 0.130390000 (date 2026-06-01)

Problem Types: CWE-617 | CWE-617 Reachable Assertion

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/C...
4.0CNADECLARED6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X
3.1[email protected]Primary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C
3.0CNADECLARED5.3MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C
2.0[email protected]Secondary5AV:N/AC:L/Au:N/C:N/I:N/A:P
2.0CNADECLARED5AV:N/AC:L/Au:N/C:N/I:N/A:P/E:ND/RL:OF/RC:C

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na TeamSpeak 3 Server affected 3.13.0 Not specified
CNA Na TeamSpeak 3 Server affected 3.13.1 Not specified
CNA Na TeamSpeak 3 Server affected 3.13.2 Not specified
CNA Na TeamSpeak 3 Server affected 3.13.3 Not specified
CNA Na TeamSpeak 3 Server affected 3.13.4 Not specified
CNA Na TeamSpeak 3 Server affected 3.13.5 Not specified
CNA Na TeamSpeak 3 Server affected 3.13.6 Not specified
CNA Na TeamSpeak 3 Server affected 3.13.7 Not specified
CNA Na TeamSpeak 3 Server unaffected 3.13.8 Not specified

References

ReferenceSourceLinkTags
files.teamspeak-services.com/docs/security/TS-SA-2026-001.html [email protected] files.teamspeak-services.com
modzero.com/en/advisories/mz-26-01-teamspeak [email protected] modzero.com
vuldb.com/vuln/366316 [email protected] vuldb.com
vuldb.com/vuln/366316/cti [email protected] vuldb.com
www.teamspeak.com/en/downloads [email protected] www.teamspeak.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Michael Imfeld (modzero) (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-05-27T00:00:00.000ZAdvisory disclosed
CNA2026-05-27T02:00:00.000ZVulDB entry created
CNA2026-05-27T18:27:22.000ZVulDB entry last update

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