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CVE-2021-1231

MEDIUMCVSS 4.7/10EPSS 0.25%

Last modified

CVE-2021-1231 is a medium-severity vulnerability rated 4.7/10 on the CVSS scale. 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. EPSS estimates a 0.25% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
4.7/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

EPSS Probability
0.25%

15.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoNx-Os11.0\(1b\)
CiscoNx-Os11.0\(1c\)
CiscoNx-Os11.0\(1d\)
CiscoNx-Os11.0\(1e\)
CiscoNx-Os11.0\(2j\)
CiscoNx-Os11.0\(2m\)
CiscoNx-Os11.0\(3f\)
CiscoNx-Os11.0\(3i\)
CiscoNx-Os11.0\(3k\)
CiscoNx-Os11.0\(3n\)
CiscoNx-Os11.0\(3o\)
CiscoNx-Os11.0\(4g\)
CiscoNx-Os11.0\(4h\)
CiscoNx-Os11.0\(4o\)
CiscoNx-Os11.0\(4q\)
CiscoNx-Os11.1\(1j\)
CiscoNx-Os11.1\(1o\)
CiscoNx-Os11.1\(1r\)
CiscoNx-Os11.1\(1s\)
CiscoNx-Os11.1\(2h\)
CiscoNx-Os11.1\(2i\)
CiscoNx-Os11.1\(3f\)
CiscoNx-Os11.1\(4e\)
CiscoNx-Os11.1\(4f\)
CiscoNx-Os11.1\(4g\)
CiscoNx-Os11.1\(4i\)
CiscoNx-Os11.1\(4l\)
CiscoNx-Os11.1\(4m\)
CiscoNx-Os11.2\(1i\)
CiscoNx-Os11.2\(1k\)
CiscoNx-Os11.2\(1m\)
CiscoNx-Os11.2\(2g\)
CiscoNx-Os11.2\(2h\)
CiscoNx-Os11.2\(2i\)
CiscoNx-Os11.2\(2j\)
CiscoNx-Os11.2\(3c\)
CiscoNx-Os11.2\(3e\)
CiscoNx-Os11.2\(3h\)
CiscoNx-Os11.2\(3m\)
CiscoNx-Os11.3\(1g\)
CiscoNx-Os11.3\(1h\)
CiscoNx-Os11.3\(1i\)
CiscoNx-Os11.3\(1j\)
CiscoNx-Os11.3\(2f\)
CiscoNx-Os11.3\(2h\)
CiscoNx-Os11.3\(2i\)
CiscoNx-Os11.3\(2j\)
CiscoNx-Os11.3\(2k\)
CiscoNx-Os12.0\(1m\)
CiscoNx-Os12.0\(1n\)

Showing 50 of 164 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-1231?
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 severe is CVE-2021-1231?
CVE-2021-1231 has a CVSS score of 4.7/10 (MEDIUM severity). The EPSS model estimates a 0.25% probability of exploitation in the next 30 days.
How do I fix CVE-2021-1231?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-1231?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST