PT-2021-2161 · Cisco · Cisco Nexus 9000 Series Fabric Switches

Adrien Peter · Published 2021-02-24 · Updated 2022-09-20 · CVE-2021-1231

Positive Technologies (AI Summary)

CVSS v3.1

4.7

Medium

Base vector

AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode (affected versions not specified)

Description A vulnerability in the Link Layer Discovery Protocol (LLDP) could allow an unauthenticated, adjacent attacker to disable switching on a small form-factor pluggable (SFP) interface. This is due to incomplete validation of the source of a received LLDP packet. An attacker could exploit this by sending a crafted LLDP packet on an SFP interface to an affected device, potentially disrupting network traffic.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Access Control

Origin Validation Error

Weakness Enumeration

CWE-284

CWE-346

Related Identifiers

BDU:2021-01054

CVE-2021-1231

Affected Products

Cisco Nexus 9000 Series Fabric Switches

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2021-1231 · Security Note
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apic-lldap-dos-WerV9CFj · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-1231 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-01054 · Security Note
• https://t.me/cvenotify/10458 · Telegram Post
• https://t.me/cibsecurity/24105 · Telegram Post
• https://t.me/cvenotify/10517 · Telegram Post