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Denial of service in Cisco NX-OS Software

Published: 2020-02-27
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-3170
Exploitation vector Network
Public exploit N/A
Vulnerable software
Cisco NX-OS
Operating systems & Components / Operating system

Cisco MDS 9000 Series Multilayer Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc

Cisco Nexus 7000 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor Cisco Systems, Inc

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Input validation error

Severity: Medium

CVSSv3: 4.6 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-3170

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

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


Install updates from vendor's website.

Vulnerable software versions

Cisco NX-OS: -

Cisco MDS 9000 Series Multilayer Switches: -

Cisco Nexus 7000 Series Switches: -

CPE External links

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.