CVE-2020-3168 Cisco Nexus 1000V Switch for VMware vSphere Secure Login Enhancements Denial of Service Vulnerability
Unauthenticated remote attackers can cause a denial of service on Cisco Nexus 1000V VSM by exhausting resources via failed CLI logins when Secure Login Enhancements are enabled.
- 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-2020-3168?
CVE-2020-3168 is a high-severity denial of service vulnerability in Cisco Nx-Os, published on 26 Feb 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the Secure Login Enhancements capability of Cisco Nexus 1000V Switch for VMware vSphere could allow an unauthenticated, remote attacker to cause an affected Nexus 1000V Virtual Supervisor Module (VSM) to become inaccessible to users through the CLI. The vulnerability is due to improper resource allocation during failed CLI login attempts when login parameters that are part of the Secure Login Enhancements capability are configured on an affected device. An attacker could exploit this vulnerability by performing a high amount of login attempts against the affected device. A successful exploit could cause the affected device to become inaccessible to other users, resulting in a denial of service (DoS) condition requiring a manual power cycle of the VSM to recover.
Which versions are affected by CVE-2020-3168?
It affects 1 product.
Products include Cisco Nx-Os.
How do I fix CVE-2020-3168?
No fix has been published for CVE-2020-3168 yet. Limit exposure of the affected software until one is available.
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-2020-3168 being exploited?
There is no known exploitation of CVE-2020-3168 in the wild and no public exploit code.
Other vulnerabilities in Cisco Nx-Os
Sources
Also known as GHSA-qqf9-xgg2-qrxx.