CVE-2026-71921
CVE-2026-71921
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.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.028 (86.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.032 · newest: 0.028 · change: -0.005
Weakness classification (CWE)
References
- www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch… (vendor-advisory)
- www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-pre-authentica… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-71921?
- CVE-2026-71921 is a critical-severity vulnerability, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-08-24.
- How severe is CVE-2026-71921?
- Critical severity. CVSS v3 base score is 9.8 out of 10.