CVE-2021-3547
OpenVPN Cert Authentication Bypass
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.
INFO
Published Date :
July 12, 2021, 11:15 a.m.
Last Modified :
Nov. 21, 2024, 6:21 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.2
Exploitability Score :
2.2
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-3547.
| URL | Resource |
|---|---|
| https://community.openvpn.net/openvpn/wiki/CVE-2021-3547 | Patch Vendor Advisory |
| https://community.openvpn.net/openvpn/wiki/SecurityAnnouncements | Vendor Advisory |
| https://community.openvpn.net/openvpn/wiki/CVE-2021-3547 | Patch Vendor Advisory |
| https://community.openvpn.net/openvpn/wiki/SecurityAnnouncements | Vendor Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-3547 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-3547 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://community.openvpn.net/openvpn/wiki/CVE-2021-3547 Added Reference https://community.openvpn.net/openvpn/wiki/SecurityAnnouncements -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Reanalysis by [email protected]
Oct. 27, 2022
Action Type Old Value New Value Removed CWE NIST CWE-287 Added CWE NIST CWE-295 -
Initial Analysis by [email protected]
Jul. 15, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Changed Reference Type https://community.openvpn.net/openvpn/wiki/CVE-2021-3547 No Types Assigned https://community.openvpn.net/openvpn/wiki/CVE-2021-3547 Patch, Vendor Advisory Changed Reference Type https://community.openvpn.net/openvpn/wiki/SecurityAnnouncements No Types Assigned https://community.openvpn.net/openvpn/wiki/SecurityAnnouncements Vendor Advisory Added CWE NIST CWE-287 Added CPE Configuration OR *cpe:2.3:a:openvpn:openvpn:3.6:*:*:*:*:*:*:* *cpe:2.3:a:openvpn:openvpn:3.6.1:*:*:*:*:*:*:*
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-3547 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-3547
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.09 }} -0.00%
score
0.35541
percentile