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CVE-2021-3547

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.

Severity
High 7.4
Published
12 Jul 2021
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
OpenVPNServers and applications · cpe:a:openvpn:openvpn
  • Version 3.6
  • Version 3.6.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-3547
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-3547