CVE-2021-3547 Security feature bypass in OpenVPN 3 Core Library
A man-in-the-middle attacker can bypass certificate authentication in OpenVPN 3 Core Library by using a spoofed server certificate with a matching hostname.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-3547?
CVE-2021-3547 is a high-severity vulnerability in OpenVPN 3 Core Library, published on 12 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2021-3547?
It affects 1 product.
Products include Openvpn Openvpn.
How do I fix CVE-2021-3547?
No fix has been published for CVE-2021-3547 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-3547 being exploited?
There is no known exploitation of CVE-2021-3547 in the wild and no public exploit code.
Other vulnerabilities in OpenVPN 3 Core Library
Sources
Also known as GHSA-2cgw-c87g-ww8q.