Is CVE-2021-1230 actively exploited?

No active exploitation of CVE-2021-1230 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-1230 be exploited remotely?

Yes. CVE-2021-1230 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-1230?

CVE-2021-1230 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2021-1230

HIGH

CVE-2021-1230

CWE-233Published: February 24, 2021· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

A vulnerability with the Border Gateway Protocol (BGP) for Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to cause a routing process to crash, which could lead to a denial of service (DoS) condition. This vulnerability is due to an issue with the installation of routes upon receipt of a BGP update. An attacker could exploit this vulnerability by sending a crafted BGP update to an affected device. A successful exploit could allow the attacker to cause the routing process to crash, which could cause the device to reload. This vulnerability applies to both Internal BGP (IBGP) and External BGP (EBGP). Note: The Cisco implementation of BGP accepts incoming BGP traffic from explicitly configured peers only. To exploit this vulnerability, an attacker would need to send a specific BGP update message over an established TCP connection that appears to come from a trusted BGP peer.

NVD Source

Technical Analysis

CVE-2021-1230 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Affected Vendors & Products

Cisco41 product(s)

nx-osnexus 9000vnexus 92160yc-xnexus 92300ycnexus 92304qcnexus 92348gc-xnexus 9236cnexus 9272qnexus 93108tc-exnexus 93108tc-ex-24nexus 93108tc-fxnexus 93108tc-fx-24+29

Source: NVD CPE · 143 total CPE entries