CVE-2019-1965: cisco cisco nx-os software Uncontrolled Resource Consumption

Vulnerability summary

CVE-2019-1965 is a high (CVSS 7.7) Uncontrolled Resource Consumption vulnerability in cisco cisco nx-os software. EPSS estimates a 1.53% chance of exploitation in the next 30 days, higher than 74.4% of scored vulnerabilities.

Timeline

1. 28-08-2019
   PublishedVulnerability first disclosed.
2. 21-11-2024
   Last modifiedVulnerability information updated.

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.

• CWE-400Uncontrolled Resource ConsumptionThe product does not properly control the allocation and maintenance of a limited resource.
• CWE-772Missing Release of Resource after Effective LifetimeThe product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.