Auth bypass in Draytek Corporation Vigorswitch Fx2120
CVE-2026-71933
Multiple DrayTek VigorSwitch models contain unauthorized operation vulnerabilities in multiple syslog functions. The vulnerability is caused by missing authorization checks. A remote attacker can trigger these vulnerabilities via crafted requests to modify configuration, restart services, save startup configuration, or clear logs.
Vulnerability class: Broken Access Control
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.
Affected products
- Draytek Corporation Vigorswitch Fx2120
- Draytek Corporation Vigorswitch G1280
- Draytek Corporation Vigorswitch G1282
- Draytek Corporation Vigorswitch G2100
- Draytek Corporation Vigorswitch G2121
- Draytek Corporation Vigorswitch G2280x
- Draytek Corporation Vigorswitch G2282x
- Draytek Corporation Vigorswitch G2540x
- Draytek Corporation Vigorswitch G2540xs
- Draytek Corporation Vigorswitch G2542x
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-71933?
- CVE-2026-71933 is a critical-severity vulnerability in Draytek Corporation Vigorswitch Fx2120, classified under Missing Authorization. CVSS score: 9.1/10. Published 2026-08-24.
- How severe is CVE-2026-71933?
- Critical severity. CVSS v3 base score is 9.1 out of 10.