EUVD-2026-64993
GHSA-6w7v-x68g-7x9r
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 delivery confirmed; administrative credentials required (PR:H); no scope change as impact is contained to the vulnerable switch; full CIA impact once credentials are held.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
Multiple 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.
AnalysisAI
Buffer overflow in DrayTek VigorSwitch's pingtrace diagnostic function allows authenticated remote attackers to cause denial of service or achieve arbitrary command execution across a broad range of VigorSwitch hardware models. The flaw arises from absent length validation when user-supplied host, count, and interval parameters are concatenated into a statically allocated buffer in the web management firmware. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires possession of valid administrative credentials for the DrayTek VigorSwitch web management interface - confirmed by both the CVE description and the CVSS 4.0 PR:H metric. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.6 (AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N) reflects a high-severity finding where the single meaningful control is the PR:H authentication requirement - an attacker must possess valid administrative credentials before the vulnerability is reachable. … 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 | Apply the firmware update published by DrayTek in their 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 administrative access to all VigorSwitch units and review access logs for unauthorized pingtrace function usage. …
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Same weakness CWE-120 – Classic Buffer Overflow
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External POC / Exploit Code
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