Denial of service in Cisco NX-OS Software

1) Input validation error

EUVDB-ID: #VU25659

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-3170

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco NX-OS: before 8.2.5

Cisco MDS 9000 Series Multilayer Switches: All versions

Cisco Nexus 7000 Series Switches: All versions

CPE2.3

• cpe:2.3:o:cisco_systems:cisco_nx-os:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_mds_9000_series_multilayer_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_nexus_7000_series_switches:*:*:*:*:*:*:*:*

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200226-nxos-api-dos

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.