cisco-sa-xripv6-spJem78K: Cisco IOS XR Software IPv6 Flood Denial of Service Vulnerability
First published: Wed Feb 03 2021(Updated: )
A vulnerability in the IPv6 protocol handling of the management interfaces of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause an IPv6 flood on the management interface network of an affected device. The vulnerability exists because the software incorrectly forwards IPv6 packets that have an IPv6 node-local multicast group address destination and are received on the management interfaces. An attacker could exploit this vulnerability by connecting to the same network as the management interfaces and injecting IPv6 packets that have an IPv6 node-local multicast group address destination. A successful exploit could allow the attacker to cause an IPv6 flood on the corresponding network. Depending on the number of Cisco IOS XR Software nodes on that network segment, exploitation could cause excessive network traffic, resulting in network degradation or a denial of service (DoS) condition. Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xripv6-spJem78K
Credit: This vulnerability was found during the resolution a Cisco TAC support case
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XR Software | =NCS1001<ncs1001-6.5.2.CSCvv45504=6.5.2<NCS1K=NCS1001<ncs1001-6.3.1.CSCvv45504=6.3.1<NCS1K | ncs1001-6.5.2.CSCvv45504 NCS1K ncs1001-6.3.1.CSCvv45504 NCS1K |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID for this Cisco IOS XR Software vulnerability?
The vulnerability ID for this Cisco IOS XR Software vulnerability is cisco-sa-xripv6-spJem78K.
What is the title of this vulnerability?
The title of this vulnerability is Cisco IOS XR Software IPv6 Flood Denial of Service Vulnerability.
What is the severity level of this vulnerability?
The severity level of this vulnerability is high.
How can an attacker exploit this vulnerability?
An unauthenticated, adjacent attacker can exploit this vulnerability by causing an IPv6 flood on the management interface network of an affected device.
Which versions of Cisco IOS XR Software are affected by this vulnerability?
The affected versions of Cisco IOS XR Software are NCS1001 6.5.2, ncs1001-6.5.2.CSCvv45504, NCS1K, 6.3.1, and ncs1001-6.3.1.CSCvv45504.
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