cisco-sa-bgp-iefab-3hb2pwtx: Cisco Nexus 3000 and 9000 Series Switches Border Gateway Protocol Denial of Service Vulnerability

Published May 20, 2026
·
Updated

A vulnerability in the Border Gateway Protocol (BGP) enforce-first-as feature of Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, remote attacker to trigger

Affected Software

2 affected components
Cisco Nexus 3000 Series Switches
Cisco Nexus 9000 Series Switches (standalone NX-OS mode)

Event History

May 20, 2026
Advisory Published
via Cisco·04:00 PM
Data Sourced
via Cisco·04:00 PM
DescriptionSeverityWeakness
Free Weekly Intel

Don't miss critical vulnerabilities

Join thousands of security professionals who receive our weekly digest of trending CVEs, zero-days, and exploited vulnerabilities.

No spam. Unsubscribe anytime.

Frequently Asked Questions

1

What is the severity of cisco-sa-bgp-iefab-3hb2pwtx?

The severity of cisco-sa-bgp-iefab-3hb2pwtx is classified as medium.

2

How do I fix cisco-sa-bgp-iefab-3hb2pwtx?

To fix cisco-sa-bgp-iefab-3hb2pwtx, update to the latest version of the NX-OS software on the affected Cisco Nexus switches.

3

What systems are affected by cisco-sa-bgp-iefab-3hb2pwtx?

cisco-sa-bgp-iefab-3hb2pwtx affects Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode.

4

What type of vulnerability is cisco-sa-bgp-iefab-3hb2pwtx?

cisco-sa-bgp-iefab-3hb2pwtx is a Denial of Service vulnerability related to the Border Gateway Protocol (BGP) enforce-first-as feature.

5

Has Cisco released a fix for cisco-sa-bgp-iefab-3hb2pwtx?

Yes, Cisco has released patches to address the vulnerability identified in cisco-sa-bgp-iefab-3hb2pwtx.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203
cisco-sa-bgp-iefab-3hb2pwtx - Cisco Nexus 3000 and 9000 Series Switches Border Gateway Protocol Denial of Service Vulnerability - SecAlerts