PT-2021-20922 · Openvpn · Openvpn 3 Core Library

Published 2021-07-12 · Updated 2022-10-27 · CVE-2021-3547

Positive Technologies (AI Summary)

CVSS v3.1

7.4

High

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions: OpenVPN 3 Core Library versions 3.6 through 3.6.1

Description: The issue allows a man-in-the-middle attacker to bypass the certificate authentication by issuing an unrelated server certificate using the same hostname found in the verify-x509-name option in a client configuration.

Recommendations: For OpenVPN 3 Core Library versions 3.6 through 3.6.1, consider updating to a version that contains a fix for this issue, as no specific workaround is provided for these versions. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Certificate Validation

Weakness Enumeration

CWE-295

CWE-305

Related Identifiers

CVE-2021-3547

Affected Products

Openvpn 3 Core Library

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2021-3547 · Security Note
• https://community.openvpn.net/openvpn/wiki/CVE-2021-3547 · Vendor Advisory
• https://community.openvpn.net/openvpn/wiki/SecurityAnnouncements · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-3547 · Vendor Advisory
• https://t.me/cvenotify/17437 · Telegram Post