CVE-2021-1230 : What You Need to Know

A vulnerability in the Border Gateway Protocol (BGP) for Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode could allow an unauthenticated attacker to crash a routing process, leading to a denial of service (DoS) condition.

Understanding CVE-2021-1230

This CVE refers to a vulnerability in the BGP implementation affecting Cisco NX-OS System Software in ACI Mode.

What is CVE-2021-1230?

The vulnerability allows a remote attacker to crash the routing process by exploiting an issue related to BGP updates received.

The Impact of CVE-2021-1230

An attacker exploiting this vulnerability could cause the affected device to reload due to a routing process crash, potentially resulting in a DoS condition.

Technical Details of CVE-2021-1230

This section covers specific technical details of the CVE.

Vulnerability Description

The vulnerability arises from a flaw in the installation of routes upon receiving a crafted BGP update, affecting both Internal BGP (IBGP) and External BGP (EBGP).

Affected Systems and Versions

Cisco Nexus 9000 Series Fabric Switches in ACI mode are affected. The specific version details are not available.

Exploitation Mechanism

An attacker can exploit this vulnerability by sending a maliciously crafted BGP update, causing the routing process to crash.

Mitigation and Prevention

Measures to address and prevent exploitation of CVE-2021-1230.

Immediate Steps to Take

It is crucial to apply vendor-provided patches and security updates promptly to mitigate the vulnerability.

Long-Term Security Practices

Implement network segmentation, access controls, and regular security assessments to enhance overall security posture.

Patching and Updates

Stay informed about security advisories from the vendor and apply patches as soon as they are released to protect the infrastructure against potential threats.