DrayTek VigorSwitch Multiple Models Buffer Overflow via pingtrace

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-71934
StatePUBLISHED
AssignerVulnCheck
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-24 18:17:18 UTC
Updated2026-08-24 20:17:17 UTC
DescriptionMultiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the pingtrace function. The vulnerability is caused by missing length checks when the host, count, and interval fields are concatenated into a fixed-size buffer. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface.

Risk And Classification

Primary CVSS: v4.0 8.6 HIGH from [email protected]

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/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

Problem Types: CWE-120 | CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.6HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS8.6HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
3.1[email protected]Secondary7.2HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS7.2HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS v4.0 Breakdown

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

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/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
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA DrayTek Corporation VigorSwitch G2540xs affected 3.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch P2540xs affected 3.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch FX2120 affected 3.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch G2282x affected 2.10.6 custom Not specified
CNA DrayTek Corporation VigorSwitch P2282x affected 2.10.6 custom Not specified
CNA DrayTek Corporation VigorSwitch Q2300x affected 2.10.7 custom Not specified
CNA DrayTek Corporation VigorSwitch PQ2300xb affected 2.10.7 custom Not specified
CNA DrayTek Corporation VigorSwitch G2542x affected 3.10.6 custom Not specified
CNA DrayTek Corporation VigorSwitch P2542x affected 3.10.6 custom Not specified
CNA DrayTek Corporation VigorSwitch P2542xh affected 3.10.6 custom Not specified
CNA DrayTek Corporation VigorSwitch PX2060 affected 2.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch G1280 affected 2.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch P1280 affected 2.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch P1281x affected 2.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch G1282 affected 2.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch P1282 affected 2.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch G2121 affected 2.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch P2121 affected 2.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch PQ2121x affected 2.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch Q2121x affected 2.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch G2280x affected 2.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch P2280x affected 2.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch Q2200x affected 2.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch PQ2200xb affected 2.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch G2100 affected 2.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch P2100 affected 2.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch G2540x affected 2.9.10 custom Not specified
CNA DrayTek Corporation VigorSwitch P2540x affected 2.9.10 custom Not specified

References

ReferenceSourceLinkTags
www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswit... [email protected] www.draytek.com
www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-buffer-overflo... [email protected] www.vulncheck.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: Jincheng Wang (@winmt) (en)

CNA: Le Yu (Nanjing University of Posts and Telecommunications) (en)

CNA: Xiapu Luo (The Hong Kong Polytechnic University) (en)

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