Vulnerability Report

CVE-2021-3547

Title: Certificate Authentication Bypass

Authentication Bypass

Proof Of Concept

No public PoC currently indexed for CVE-2021-3547.

CWE Category CWE-295

Published Date Jul 12, 2021

Modified Date Nov 21, 2024

Exploit Status Not Found

Score 7.4 CVSS v3.1

Exploit Probability (EPSS)

1.14%

Vulnerability Summary

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.

Impacted Vendors

openvpn 1

aviatrix 1

Reference Links

https://community.openvpn.net/openvpn/wiki/CVE-2021-3547 https://community.openvpn.net/openvpn/wiki/SecurityAnnouncements https://community.openvpn.net/openvpn/wiki/CVE-2021-3547 https://community.openvpn.net/openvpn/wiki/SecurityAnnouncements

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.4

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v2.0

Source Entity [email protected]

Severity MEDIUM

5.8

Access Vector

N/A

Authentication

N/A

RAW VECTOR AV:N/AC:M/Au:N/C:P/I:P/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-3547 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

November 21, 2024 MODIFIED

Vulnerability data or affected products updated.

July 12, 2021 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity HIGH

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected Stack

No specific products linked.