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.

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

Published 2026-08-24 · last modified 2026-08-26.

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.

EPSS exploit prediction

EPSS: 0.006 (44.4th percentile), scored 2026-10-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002

Affected products

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch… (vendor-advisory)
www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-missing-author… (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.