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Cisco Bug: CSCvn57900 - Cisco NX-OS Software NX-API Denial of Service Vulnerability

Last Modified

Aug 28, 2019

Products (1)

  • Cisco Nexus 5000 Series Switches

Known Affected Releases

8.4(0)SK(0.119)

Description (partial)

Symptom:
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 the targeted 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 will still be available and passing network traffic.

Note: The NX-API feature is disabled by default.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nxos-api-dos

Conditions:
Please refer to the Security Advisory.
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Bug Details Include

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