CVE-2021-43118: DrayTek VIGOR2960 Firmware

Critical severity, CVSS 9.8. EPSS: 34.8% chance of exploitation in the next 30 days.

A Remote Command Injection vulnerability exists in DrayTek Vigor 2960 1.5.1.3, DrayTek Vigor 3900 1.5.1.3, and DrayTek Vigor 300B 1.5.1.3 via a crafted HTTP message containing malformed QUERY STRING in mainfunction.cgi, which could let a remote malicious user execute arbitrary code.

Affected products

• DrayTek VIGOR2960 Firmware: version 1.5.1.3 only
• DrayTek VIGOR300B Firmware: version 1.5.1.3 only
• DrayTek VIGOR3900 Firmware: version 1.5.1.3 only

Published 2022-03-29. Last modified 2026-06-17.