cisco-sa-xrncs-epni-int-dos-TWMffUsN: Cisco IOS XR Egress Packet Network Interface Aligner Interrupt Denial of Service Vulnerability

Published Mar 11, 2026
·
Updated

A vulnerability in the handling of an Egress Packet Network Interface (EPNI) Aligner interrupt in Cisco IOS XR Software for Cisco Network Convergence System (NCS) 5500 Series with NC57 line cards and Cisco NCS 5700 Routers and Cisco IOS XR Software for Third Party Software could allow an

Affected Software

3 affected components
Cisco IOS XR
Cisco NCS 5500 Series
Cisco NCS 5700 Routers

Event History

Mar 11, 2026
Advisory Published
via Cisco·04:00 PM
Data Sourced
via Cisco·04:00 PM
DescriptionSeverityWeakness

Child vulnerabilities

Contains the following vulnerabilities.

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Frequently Asked Questions

1

What is the severity of cisco-sa-xrncs-epni-int-dos-TWMffUsN?

The severity of cisco-sa-xrncs-epni-int-dos-TWMffUsN is considered high due to potential Denial of Service impacts.

2

How do I fix cisco-sa-xrncs-epni-int-dos-TWMffUsN?

To fix cisco-sa-xrncs-epni-int-dos-TWMffUsN, you should update your Cisco IOS XR Software to the latest recommended version.

3

What devices are affected by cisco-sa-xrncs-epni-int-dos-TWMffUsN?

Cisco IOS XR software running on Cisco Network Convergence System 5500 series with NC57 line cards is affected by cisco-sa-xrncs-epni-int-dos-TWMffUsN.

4

Is there a workaround for cisco-sa-xrncs-epni-int-dos-TWMffUsN?

There are currently no documented workarounds for cisco-sa-xrncs-epni-int-dos-TWMffUsN.

5

What type of attack does cisco-sa-xrncs-epni-int-dos-TWMffUsN involve?

cisco-sa-xrncs-epni-int-dos-TWMffUsN involves a Denial of Service attack that targets the Egress Packet Network Interface Aligner.

Contact

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