CVE-2026-71921: DrayTek Corporation Vigorswitch FX2120

Critical severity, CVSS 9.8. EPSS: 2.8% chance of exploitation in the next 30 days.

Multiple DrayTek VigorSwitch models contain a pre-authentication command injection vulnerability in the setget.cgi interface. The vulnerability is caused by insufficient filtering of the pass field before command execution. A remote attacker can trigger this vulnerability via crafted input to execute arbitrary commands with root privileges.

Affected products

• DrayTek Corporation Vigorswitch FX2120: before 3.9.10 (fixed in 3.9.10)
• DrayTek Corporation Vigorswitch g1280: before 2.9.10 (fixed in 2.9.10)
• DrayTek Corporation Vigorswitch g1282: before 2.9.10 (fixed in 2.9.10)
• DrayTek Corporation Vigorswitch g2100: before 2.9.10 (fixed in 2.9.10)
• DrayTek Corporation Vigorswitch g2121: before 2.9.10 (fixed in 2.9.10)
• DrayTek Corporation Vigorswitch g2280x: before 2.9.10 (fixed in 2.9.10)
• DrayTek Corporation Vigorswitch g2282x: before 2.10.6 (fixed in 2.10.6)
• DrayTek Corporation Vigorswitch g2540x: before 2.9.10 (fixed in 2.9.10)
• DrayTek Corporation Vigorswitch g2540xs: before 3.9.10 (fixed in 3.9.10)
• DrayTek Corporation Vigorswitch g2542x: before 3.10.6 (fixed in 3.10.6)
• DrayTek Corporation Vigorswitch p1280: before 2.9.10 (fixed in 2.9.10)
• DrayTek Corporation Vigorswitch p1281x: before 2.9.10 (fixed in 2.9.10)
• DrayTek Corporation Vigorswitch p1282: before 2.9.10 (fixed in 2.9.10)
• DrayTek Corporation Vigorswitch p2100: before 2.9.10 (fixed in 2.9.10)
• DrayTek Corporation Vigorswitch p2121: before 2.9.10 (fixed in 2.9.10)
• DrayTek Corporation Vigorswitch p2280x: before 2.9.10 (fixed in 2.9.10)
• DrayTek Corporation Vigorswitch p2282x: before 2.10.6 (fixed in 2.10.6)
• DrayTek Corporation Vigorswitch p2540x: before 2.9.10 (fixed in 2.9.10)
• DrayTek Corporation Vigorswitch p2540xs: before 3.9.10 (fixed in 3.9.10)
• DrayTek Corporation Vigorswitch p2542x: before 3.10.6 (fixed in 3.10.6)
• DrayTek Corporation Vigorswitch p2542xh: before 3.10.6 (fixed in 3.10.6)
• DrayTek Corporation Vigorswitch PQ2121X: before 2.9.10 (fixed in 2.9.10)
• DrayTek Corporation Vigorswitch PQ2200XB: before 2.9.10 (fixed in 2.9.10)
• DrayTek Corporation Vigorswitch PQ2300XB: before 2.10.7 (fixed in 2.10.7)
• DrayTek Corporation Vigorswitch PX2060: before 2.9.10 (fixed in 2.9.10)
• and 3 more

Published 2026-08-24. Last modified 2026-08-27.