What is CVE-2021-31606?

CVE-2021-31606 is a high-severity vulnerability in Openvpn-Monitor Project, classified under Improper Authentication. CVSS score: 7.5/10. Published 2021-09-27.

How severe is CVE-2021-31606?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Openvpn-Monitor Project

CVE-2021-31606

furlongm openvpn-monitor through 1.1.3 allows Authorization Bypass to disconnect arbitrary clients.

Vulnerability class: Broken Authentication

Published 2021-09-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.025 (84.5th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 84.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000

Affected products

Openvpn-Monitor Project

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

github.com/furlongm/openvpn-monitor/releases (Third Party Advisory)
packetstormsecurity.com/files/164274/OpenVPN-Monitor-1.1.3-Authorization-Bypass… (VDB Entry, Third Party Advisory)
github.com/furlongm/openvpn-monitor/commit/ddb9d31ef0ec56f578bdacf99ebe9d68455e… (Patch)

Frequently asked questions

What is CVE-2021-31606?: CVE-2021-31606 is a high-severity vulnerability in Openvpn-Monitor Project, classified under Improper Authentication. CVSS score: 7.5/10. Published 2021-09-27.
How severe is CVE-2021-31606?: High severity. CVSS v3 base score is 7.5 out of 10.