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High severity7.4NVD Advisory· Published Jul 12, 2021· Updated Jun 17, 2026

CVE-2021-3547

CVE-2021-3547

Description

OpenVPN 3 Core Library version 3.6 and 3.6.1 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.

Affected products

4
  • OpenVPN/OpenVPN 3 Core Libraryllm-create2 versions
    3.6, 3.6.1+ 1 more
    • (no CPE)range: 3.6, 3.6.1
    • (no CPE)
  • OpenVPN/OpenVPN2 versions
    cpe:2.3:a:openvpn:openvpn:3.6:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:openvpn:openvpn:3.6:*:*:*:*:*:*:*
    • cpe:2.3:a:openvpn:openvpn:3.6.1:*:*:*:*:*:*:*

Patches

Vulnerability mechanics

References

2

News mentions

0

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