CVE-2017-7521 Denial of service in OpenVPN
Remote attackers can cause denial of service in OpenVPN servers via memory exhaustion from leaks and double-free errors in certificate processing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-7521?
CVE-2017-7521 is a medium-severity denial of service vulnerability in OpenVPN, published on 27 Jun 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to remote denial-of-service due to memory exhaustion caused by memory leaks and double-free issue in extract_x509_extension().
Which versions are affected by CVE-2017-7521?
It affects 1 product.
Products include Openvpn Openvpn.
How do I fix CVE-2017-7521?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2017-7521 being exploited?
There is no known exploitation of CVE-2017-7521 in the wild and no public exploit code.
Other vulnerabilities in OpenVPN
Sources
Also known as DEBIAN-CVE-2017-7521, GHSA-mmxr-6344-9fv5, UBUNTU-CVE-2017-7521.