EUVD-2026-64997
GHSA-x775-m3v2-h228
Severity by source
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
Network-reachable via web interface with low complexity, but PR:H reflects mandatory admin credentials; scope unchanged as switch firmware impact does not cascade to subsequent systems.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the switch_lan_gvrp function. The vulnerability is caused by unsafe copying of the portList field into an undersized 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.
AnalysisAI
Buffer overflow in DrayTek VigorSwitch's switch_lan_gvrp function exposes multiple managed switch models to denial of service or potential arbitrary command execution from remote, authenticated attackers. The flaw stems from unsafe copying of a user-supplied portList field into an undersized stack or heap buffer within the GVRP handling code - a classic CWE-120 defect reachable via the device's web management interface. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires valid administrative credentials for the DrayTek VigorSwitch web management interface - specifically, the attacker must be authenticated as an administrator to reach the switch_lan_gvrp GVRP configuration endpoint where the vulnerable portList parameter is processed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H) scores 8.6, reflecting a network-reachable flaw with high confidentiality, integrity, and availability impact, but requiring high-privilege (administrative) credentials - a critical moderating factor. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remediation is to apply firmware updates from DrayTek as described in the vendor's August 2026 security advisory at https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit and document all administrative access to VigorSwitch devices and review current access control policies. …
Sign in for detailed remediation steps and compensating controls.
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Same weakness CWE-120 – Classic Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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