EUVD-2026-64986
GHSA-84fg-qvhg-whv8
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 management interface (AV:N), no complexity beyond credentials (AC:L), high-privilege authentication required (PR:H); full impact on the switch but no scope change (S:U).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
Multiple DrayTek VigorSwitch models contain a command injection vulnerability in the rebDevice 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's rebDevice function allows authenticated remote attackers with valid administrative credentials to execute arbitrary OS commands with root privileges by submitting crafted username or password values through the web management interface. At least 10 VigorSwitch models are confirmed affected per CPE data, with tags suggesting coverage across roughly 28 distinct models spanning the G, P, Q, PQ, and FX product lines. …
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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 4.0 vector confirms PR:H, meaning high-privilege authenticated access is mandatory. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.6 reflects a network-accessible (AV:N), low-complexity (AC:L) attack requiring high-privilege credentials (PR:H) with no user interaction, resulting in full confidentiality, integrity, and availability compromise of the vulnerable system. … 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 vendor-released patch per the DrayTek security advisory at https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/ - the advisory does not specify an exact patched firmware version number in the data available at time of analysis, so administrators should check the advisory directly for per-model firmware update links. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, create an inventory of all DrayTek VigorSwitch deployments, identify which user accounts possess administrative credentials, and document the network segments these devices control. …
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External POC / Exploit Code
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