CVE-2019-1965 Cisco NX-OS Software Remote Management Memory Leak Denial of Service Vulnerability
Authenticated remote attackers can cause a system-wide denial of service by triggering a memory leak in Cisco NX-OS VSH session management.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-1965?
CVE-2019-1965 is a high-severity denial of service vulnerability in Cisco Nx-Os, published on 28 Aug 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability in the Virtual Shell (VSH) session management for Cisco NX-OS Software could allow an authenticated, remote attacker to cause a VSH process to fail to delete upon termination. This can lead to a build-up of VSH processes that overtime can deplete system memory. When there is no system memory available, this can cause unexpected system behaviors and crashes. The vulnerability is due to the VSH process not being properly deleted when a remote management connection to the device is disconnected. An attacker could exploit this vulnerability by repeatedly performing a remote management connection to the device and terminating the connection in an unexpected manner. A successful exploit could allow the attacker to cause the VSH processes to fail to delete, which can lead to a system-wide denial of service (DoS) condition. The attacker must have valid user credentials to log in to the device using the remote management connection.
Which versions are affected by CVE-2019-1965?
It affects 1 product.
Products include Cisco Nx-Os.
How do I fix CVE-2019-1965?
No fix has been published for CVE-2019-1965 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-2019-1965 being exploited?
There is no known exploitation of CVE-2019-1965 in the wild and no public exploit code.
Other vulnerabilities in Cisco Nx-Os
Sources
Also known as GHSA-6q32-36x4-ww95.