Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigo
- https://www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-os-comm
FAQ
What is CVE-2026-71931?
CVE-2026-71931 is a vulnerability with a CVSS score of 7.2 (HIGH). 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 concatena...
How severe is CVE-2026-71931?
CVE-2026-71931 has been rated HIGH with a CVSS base score of 7.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-71931?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.