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Denial of service in Cisco Nexus 1000V Switch for VMware vSphere

Published: 2020-02-27
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-3168
Exploitation vector Network
Public exploit N/A
Vulnerable software
Cisco Nexus 1000v Application Virtual Switch
Server applications / Virtualization software

Cisco NX-OS
Operating systems & Components / Operating system

Vendor Cisco Systems, Inc

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Resource management error

Severity: Medium

CVSSv3: 6.5 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-3168

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No


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

The vulnerability exists due to improper resource allocation during failed CLI login attempts when login parameters that are part of the Secure Login Enhancements capability are configured on an affected device. A remote attacker can perform a high amount of login attempts against the affected device and cause it to become inaccessible to other users, resulting in a denial of service condition requiring a manual power cycle of the VSM to recover.


Install updates from vendor's website.

Vulnerable software versions

Cisco Nexus 1000v Application Virtual Switch: -

Cisco NX-OS: 5.2(1)SV3(4.1a)

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.