EUVD-2026-64987
GHSA-q8x9-vhc2-6p4c
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
Admin credentials required (PR:H) and network-reachable management interface (AV:N/AC:L); root-level command execution yields full C/I/H/A:H impact; no scope change to other systems.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
Multiple DrayTek VigorSwitch models contain a command injection vulnerability in the fdftDevice function. The vulnerability is caused by insufficient filtering of the username and password fields before command execution. A remote attacker can trigger this vulnerability via crafted input to execute arbitrary commands with root privileges. Exploitation requires valid administrative credentials for the device's web management interface.
AnalysisAI
Command injection in DrayTek VigorSwitch firmware's fdftDevice function allows an authenticated remote administrator to execute arbitrary OS commands with root privileges by supplying crafted input in the username or password fields of the web management interface. Approximately 28 VigorSwitch models across the G, P, Q, and PQ series are affected, confirmed by both VulnCheck reporting and a DrayTek vendor advisory published August 2026. …
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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 - the CVSS PR:H metric confirms this high-privilege prerequisite; unauthenticated exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 8.6 reflects full impact across confidentiality, integrity, and availability, but this must be read alongside the PR:H prerequisite - valid administrative credentials are required, which significantly narrows the realistic attack surface compared to unauthenticated network vulnerabilities. … 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 fix is to apply firmware updates per DrayTek's August 2026 security advisory at https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/; exact patched firmware version numbers must be confirmed directly from that advisory, as specific fixed versions are not enumerated in the available intelligence data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all affected DrayTek VigorSwitch models (G, P, Q, PQ series) in your environment and document current administrative access controls. …
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Same weakness CWE-78 – OS Command Injection
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External POC / Exploit Code
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