cisco-sa-npspin-QYpwdhFD: Cisco IOS XR Software for ASR 9000 Series Routers Denial of Service Vulnerability
First published: Wed Sep 08 2021(Updated: )
A vulnerability in the Layer 2 punt code of Cisco IOS XR Software running on Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, adjacent attacker to cause the affected line card to reboot. This vulnerability is due to incorrect handling of specific Ethernet frames that cause a spin loop that can make the network processors unresponsive. An attacker could exploit this vulnerability by sending specific types of Ethernet frames on the segment where the affected line cards are attached. A successful exploit could allow the attacker to cause the affected line card to reboot. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-npspin-QYpwdhFD This advisory is part of the September 2021 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2021 Cisco IOS XR Software Security Advisory Bundled Publication.
Credit: This vulnerability was found during the resolution a Cisco TAC support case
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XR Software | ||
| Cisco IOS XR Software | =6.5.3<ASR9K-X64ASR9K-PX=6.4.2<ASR9K-X64 | ASR9K-X64ASR9K-PX ASR9K-X64 |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID for this Cisco IOS XR Software vulnerability?
The vulnerability ID is cisco-sa-npspin-QYpwdhFD.
What is the title of this vulnerability?
The title of this vulnerability is Cisco IOS XR Software for ASR 9000 Series Routers Denial of Service Vulnerability.
What is the severity of the Cisco IOS XR Software vulnerability?
The severity of the Cisco IOS XR Software vulnerability is high with a severity value of 7.4.
Which software and routers are affected by this vulnerability?
This vulnerability affects Cisco IOS XR Software running on Cisco ASR 9000 Series Aggregation Services Routers.
What is the impact of this vulnerability?
The impact of this vulnerability is that an unauthenticated, adjacent attacker can cause the affected line card to reboot.
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