CVE-2021-1231
Description
A vulnerability in the Link Layer Discovery Protocol (LLDP) for Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, adjacent attacker to disable switching on a small form-factor pluggable (SFP) interface. This vulnerability is due to incomplete validation of the source of a received LLDP packet. An attacker could exploit this vulnerability by sending a crafted LLDP packet on an SFP interface to an affected device. A successful exploit could allow the attacker to disable switching on the SFP interface, which could disrupt network traffic.
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cisco nx-os | 11.0\(1b\), 11.0\(1c\), 11.0\(1d\), 11.0\(1e\), 11.0\(2j\), 11.0\(2m\), 11.0\(3f\), 11.0\(3i\), 11.0\(3k\), 11.0\(3n\), 11.0\(3o\), 11.0\(4g\), 11.0\(4h\), 11.0\(4o\), 11.0\(4q\), 11.1\(1j\), 11.1\(1o\), 11.1\(1r\), 11.1\(1s\), 11.1\(2h\), 11.1\(2i\), 11.1\(3f\), 11.1\(4e\), 11.1\(4f\), 11.1\(4g\), 11.1\(4i\), 11.1\(4l\), 11.1\(4m\), 11.2\(1i\), 11.2\(1k\), 11.2\(1m\), 11.2\(2g\), 11.2\(2h\), 11.2\(2i\), 11.2\(2j\), 11.2\(3c\), 11.2\(3e\), 11.2\(3h\), 11.2\(3m\), 11.3\(1g\), 11.3\(1h\), 11.3\(1i\), 11.3\(1j\), 11.3\(2f\), 11.3\(2h\), 11.3\(2i\), 11.3\(2j\), 11.3\(2k\), 12.0\(1m\), 12.0\(1n\), 12.0\(1o\), 12.0\(1p\), 12.0\(1q\), 12.0\(1r\), 12.0\(2f\), 12.0\(2g\), 12.0\(2h\), 12.0\(2l\), 12.0\(2m\), 12.0\(2n\), 12.0\(2o\), 12.1\(1h\), 12.1\(1i\), 12.1\(2e\), 12.1\(2g\), 12.1\(2k\), 12.1\(3g\), 12.1\(3h\), 12.1\(3j\), 12.1\(4a\), 12.2\(1k\), 12.2\(1n\), 12.2\(1o\), 12.2\(2e\), 12.2\(2f\), 12.2\(2i\), 12.2\(2j\), 12.2\(2k\), 12.2\(2q\), 12.2\(3j\), 12.2\(3p\), 12.2\(3r\), 12.2\(3s\), 12.2\(3t\), 12.2\(4f\), 12.2\(4p\), 12.2\(4q\), 12.2\(4r\), 12.3\(1e\), 12.3\(1f\), 12.3\(1i\), 12.3\(1l\), 12.3\(1o\), 12.3\(1p\), 13.0\(1k\), 13.0\(2h\), 13.0\(2k\), 13.0\(2n\), 13.1\(1i\), 13.1\(2m\), 13.1\(2o\), 13.1\(2p\), 13.1\(2q\), 13.1\(2s\), 13.1\(2t\), 13.1\(2u\), 13.1\(2v\), 13.2\(1l\), 13.2\(1m\), 13.2\(2l\), 13.2\(2o\), 13.2\(3i\), 13.2\(3j\), 13.2\(3n\), 13.2\(3o\), 13.2\(3r\), 13.2\(3s\), 13.2\(4d\), 13.2\(4e\), 13.2\(5d\), 13.2\(5e\), 13.2\(5f\), 13.2\(6i\), 13.2\(7f\), 13.2\(7k\), 13.2\(8d\), 13.2\(9b\), 13.2\(9f\), 13.2\(9h\), 13.2\(41d\), 14.0\(1h\), 14.0\(2c\), 14.0\(3c\), 14.0\(3d\), 14.1\(1i\), 14.1\(1j\), 14.1\(1k\), 14.1\(1l\), 14.1\(2g\), 14.1\(2m\), 14.1\(2o\), 14.1\(2s\), 14.1\(2u\), 14.1\(2w\), 14.1\(2x\), 14.2\(1i\), 14.2\(1j\), 14.2\(1l\), 14.2\(2e\), 14.2\(2f\), 14.2\(2g\), 14.2\(3j\), 14.2\(3l\), 14.2\(3n\), 14.2\(3q\), 14.2\(4i\), 14.2\(4k\), 14.2\(4o\), 14.2\(4p\), 14.2\(5k\), 15.0\(1k\), 15.0\(1l\), 15.0\(2e\), 15.0\(2h\) | — |
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