CVE-2021-3824

Name: CVE-2021-3824
Creator: NVD / NIST
Published: 2021-09-23T15:15:07.973+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.72%

Last modified Jun 17, 2026

CVE-2021-3824 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. OpenVPN Access Server 2.9.0 through 2.9.4 allow remote attackers to inject arbitrary web script or HTML via the web login page URL.. EPSS estimates a 0.72% chance of exploitation in the next 30 days.

Description

OpenVPN Access Server 2.9.0 through 2.9.4 allow remote attackers to inject arbitrary web script or HTML via the web login page URL.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.72%

49.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Openvpn	Openvpn Access Server	>= 2.9.0, <= 2.9.4

References

https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-9-5Release Notes, Vendor Advisory
https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-9-5Release Notes, Vendor Advisory

Timeline

Published: Sep 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3824?

OpenVPN Access Server 2.9.0 through 2.9.4 allow remote attackers to inject arbitrary web script or HTML via the web login page URL.

How severe is CVE-2021-3824?

CVE-2021-3824 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.72% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3824?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3824?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST