Vulnerability Description
Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the switch_lan_gvrp function. The vulnerability is caused by unsafe copying of the portList field into an undersized 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.
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-buffer-
FAQ
What is CVE-2026-71938?
CVE-2026-71938 is a vulnerability with a CVSS score of 7.2 (HIGH). Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the switch_lan_gvrp function. The vulnerability is caused by unsafe copying of the portList field into an undersized buff...
How severe is CVE-2026-71938?
CVE-2026-71938 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-2026-71938?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.