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8.6

DrayTek VigorSwitch lets logged‑in admins run arbitrary code

CVE-2026-71943 · published 2 months ago
Summary

Several DrayTek VigorSwitch models let someone with valid web‑admin credentials enter specially crafted usernames or passwords that cause the device to run any command as the system’s top‑level user. This could let an attacker take full control of the switch. Apply the latest firmware from DrayTek, use strong unique admin passwords, and limit web‑admin access to trusted networks.

What to do
  • Update draytek corporation vigorswitch g2540xs to version 3.9.10 or later.
  • Update draytek corporation vigorswitch p2540xs to version 3.9.10 or later.
  • Update draytek corporation vigorswitch fx2120 to version 3.9.10 or later.
  • Update draytek corporation vigorswitch g2282x to version 2.10.6 or later.
  • Update draytek corporation vigorswitch p2282x to version 2.10.6 or later.
  • Update draytek corporation vigorswitch q2300x to version 2.10.7 or later.
  • Update draytek corporation vigorswitch pq2300xb to version 2.10.7 or later.
  • Update draytek corporation vigorswitch g2542x to version 3.10.6 or later.
  • Update draytek corporation vigorswitch p2542x to version 3.10.6 or later.
  • Update draytek corporation vigorswitch p2542xh to version 3.10.6 or later.
  • Update draytek corporation vigorswitch px2060 to version 2.9.10 or later.
  • Update draytek corporation vigorswitch g1280 to version 2.9.10 or later.
  • Update draytek corporation vigorswitch p1280 to version 2.9.10 or later.
  • Update draytek corporation vigorswitch p1281x to version 2.9.10 or later.
  • Update draytek corporation vigorswitch g1282 to version 2.9.10 or later.
  • Update draytek corporation vigorswitch p1282 to version 2.9.10 or later.
  • Update draytek corporation vigorswitch g2121 to version 2.9.10 or later.
  • Update draytek corporation vigorswitch p2121 to version 2.9.10 or later.
  • Update draytek corporation vigorswitch pq2121x to version 2.9.10 or later.
  • Update draytek corporation vigorswitch q2121x to version 2.9.10 or later.
  • Update draytek corporation vigorswitch g2280x to version 2.9.10 or later.
  • Update draytek corporation vigorswitch p2280x to version 2.9.10 or later.
  • Update draytek corporation vigorswitch q2200x to version 2.9.10 or later.
  • Update draytek corporation vigorswitch pq2200xb to version 2.9.10 or later.
  • Update draytek corporation vigorswitch g2100 to version 2.9.10 or later.
  • Update draytek corporation vigorswitch p2100 to version 2.9.10 or later.
  • Update draytek corporation vigorswitch g2540x to version 2.9.10 or later.
  • Update draytek corporation vigorswitch p2540x to version 2.9.10 or later.
Affected software
VendorProductAffected versions
draytek corporation vigorswitch g2540xs < 3.9.10
draytek corporation vigorswitch p2540xs < 3.9.10
draytek corporation vigorswitch fx2120 < 3.9.10
draytek corporation vigorswitch g2282x < 2.10.6
draytek corporation vigorswitch p2282x < 2.10.6
draytek corporation vigorswitch q2300x < 2.10.7
draytek corporation vigorswitch pq2300xb < 2.10.7
draytek corporation vigorswitch g2542x < 3.10.6
draytek corporation vigorswitch p2542x < 3.10.6
draytek corporation vigorswitch p2542xh < 3.10.6
draytek corporation vigorswitch px2060 < 2.9.10
draytek corporation vigorswitch g1280 < 2.9.10
draytek corporation vigorswitch p1280 < 2.9.10
draytek corporation vigorswitch p1281x < 2.9.10
draytek corporation vigorswitch g1282 < 2.9.10
draytek corporation vigorswitch p1282 < 2.9.10
draytek corporation vigorswitch g2121 < 2.9.10
draytek corporation vigorswitch p2121 < 2.9.10
draytek corporation vigorswitch pq2121x < 2.9.10
draytek corporation vigorswitch q2121x < 2.9.10
draytek corporation vigorswitch g2280x < 2.9.10
draytek corporation vigorswitch p2280x < 2.9.10
draytek corporation vigorswitch q2200x < 2.9.10
draytek corporation vigorswitch pq2200xb < 2.9.10
draytek corporation vigorswitch g2100 < 2.9.10
draytek corporation vigorswitch p2100 < 2.9.10
draytek corporation vigorswitch g2540x < 2.9.10
draytek corporation vigorswitch p2540x < 2.9.10
Original advisory text
DrayTek VigorSwitch Multiple Models OS Command Injection via setDevNet
Multiple DrayTek VigorSwitch models contain a command injection vulnerability in the setDevNet function. The vulnerability is caused by insufficient filtering of the username and password fields before command execution. 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.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
8.6 High
Exploitation
2% chance of attack within 30 days
Type
CWE-78OS Command Injection
Timeline
Published24 Aug 2026
Updated29 Oct 2026
First seen24 Aug 2026
Sources
CVE-2026-71943 · NVD
CVE-2026-71943 · MITRE
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