What is CVE-2021-31604?

CVE-2021-31604 is a medium-severity vulnerability in Openvpn-Monitor Project, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.5/10. Published 2021-09-27.

How severe is CVE-2021-31604?

Medium severity. CVSS v3 base score is 6.5 out of 10.

CSRF in Openvpn-Monitor Project

CVE-2021-31604

furlongm openvpn-monitor through 1.1.3 allows CSRF to disconnect an arbitrary client.

Vulnerability class: CSRF (Cross-Site Request Forgery)

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

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (50.7th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Openvpn-Monitor Project

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

github.com/furlongm/openvpn-monitor/releases (Third Party Advisory, Release Notes)
packetstormsecurity.com/files/164281/OpenVPN-Monitor-1.1.3-Cross-Site-Request-F… (Exploit, VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2021-31604?: CVE-2021-31604 is a medium-severity vulnerability in Openvpn-Monitor Project, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.5/10. Published 2021-09-27.
How severe is CVE-2021-31604?: Medium severity. CVSS v3 base score is 6.5 out of 10.