EUVD-2026-64990
GHSA-cppc-jg2v-27ff
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
Administrative authentication required (PR:H per description and CVSS 4.0 input); root execution scoped to the switch itself with no lateral scope change (S:U), consistent with SC:N/SI:N/SA:N in the provided 4.0 vector.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
Multiple DrayTek VigorSwitch models contain a command injection vulnerability in the tftp_upgrade function. The vulnerability is caused by insufficient filtering before the filename field is concatenated into a command. 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 tftp_upgrade function enables authenticated remote administrators to execute arbitrary OS commands with root privileges. At least 28 VigorSwitch models across DrayTek's managed switch lineup are affected, spanning both Gigabit and PoE/fiber variants. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Valid administrative credentials to the DrayTek VigorSwitch web management interface are required - CVSS PR:H explicitly confirms high-privilege authentication as a hard prerequisite, and the CVE description states 'valid administrative credentials for the device's web management interface.' The TFTP upgrade function must be reachable via the management interface, which is standard default functionality. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N) is internally consistent with the description: the management interface is network-reachable (AV:N), exploitation requires no special timing or race conditions (AC:L/AT:N), but a full administrative account is a hard prerequisite (PR:H). … 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 | Consult the DrayTek security advisory at https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/ for firmware update packages and exact patched version numbers, which are not independently confirmed in the available data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all DrayTek VigorSwitch deployments to identify affected models in your infrastructure and audit recent administrative access logs for suspicious tftp_upgrade function calls or unexpected command execution events. …
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Same weakness CWE-78 – OS Command Injection
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External POC / Exploit Code
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