Vulnerability identifier: #VU20487

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-1968

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco NX-OS
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to cause a system process to unexpectedly restart.

The vulnerability exists due to incorrect validation of the HTTP header of a request that is sent to the NX-API feature. A remote attacker can send a specially crafted HTTP request to the NX-API and 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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco NX-OS: 6.0.2 A8 - 9.2

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nxos-api-dos

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.