CVE-2019-1968: Cisco NX-OS

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

A vulnerability in the NX-API feature of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause an NX-API system process to unexpectedly restart. The vulnerability is due to incorrect validation of the HTTP header of a request that is sent to the NX-API. An attacker could exploit this vulnerability by sending a crafted HTTP request to the NX-API on an affected device. A successful exploit could allow the attacker to cause a denial of service (DoS) condition in the NX-API service; however, the NX-OS device itself would still be available and passing network traffic. Note: The NX-API feature is disabled by default.

Affected products

• Cisco NX-OS: version 7.3 only; version 8.1 only; version 8.2 only; version 8.3 only; version 6.1(2)i2 only; version 6.1(2)i3 only; …

Published 2019-08-30. Last modified 2026-06-17.