Is CVE-2024-20321 being actively exploited?

CVE-2024-20321 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2024-20321?

CVE-2024-20321 has a CVSS 3.1 base score of 8.6 (HIGH).

CVE-2024-20321

HIGH · CVSS 8.6EPSS 0.7%EU EUVD

A vulnerability in the External Border Gateway Protocol (eBGP) implementation of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because eBGP traffic is mapped to a shared hardware rate-limiter queue. An attacker could exploit this vulnerability by sending large amounts of network traffic with certain characteristics through an affected device. A successful exploit could allow the attacker to cause eBGP neighbor sessions to be dropped, leading to a DoS condition in the network.

Key facts

CVSS score: 8.6 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Weakness (CWE): CWE-400
EPSS score: 0.7% (52th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2024-18036)
Published: February 29, 2024
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2024-18036 in the EU Vulnerability Database. Last updated in EUVD on August 16, 2024.

View on the EU Vulnerability Database

Affected products

cisco / nx-os
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Certified products that may be affected

3 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Cisco Nexus 9000 MACsec Series Switches Running NX-OS 10.4 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-11683-2026 - active
Cisco Nexus 9000 Series Switches Running NX-OS 10.4 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-11514-2025 - active
Cisco Nexus 3000 and 9000 Series Switches running NX-OS 9.3 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-11173-2021 - archived

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ebgp-dos-L3QCwVJ(Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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