Denial of service in Cisco Nexus 3000 and 9000 Series Switches

1) Input validation error

EUVDB-ID: #VU79940

Risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-20169

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 insufficient validation of user-supplied input in the Intermediate System-to-Intermediate System (IS-IS) protocol. A remote attacker on the local network can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco NX-OS: 10.3(2)

Cisco Nexus 3000 Series Switches: All versions

Cisco Nexus 9000 Series Switches NX-OS Mode: All versions

CPE2.3

• cpe:2.3:o:cisco_systems:cisco_nx-os:10.3(2):*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_nexus_3000_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_nexus_9000_series_switches_nx-os_mode:*:*:*:*:*:*:*:*

External links

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-n3_9k-isis-dos-FTCXB4Vb

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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