CVE-2021-1268: Cisco IOS XR Software IPv6 Flood Denial of Service Vulnerability
First published: Thu Feb 04 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.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XR | <6.7.3 | |
| Cisco IOS XR | >=7.1.0<7.1.3 | |
| Cisco IOS XR | >=7.2.0<7.2.2 | |
| Cisco IOS XR | =7.3.0 | |
| Cisco Ncs 1001 | ||
| Cisco Ncs 1002 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
Frequently Asked Questions
What is CVE-2021-1268?
CVE-2021-1268 is a vulnerability in the IPv6 protocol handling of the management interfaces of Cisco IOS XR Software.
How does CVE-2021-1268 affect Cisco IOS XR Software?
CVE-2021-1268 allows an unauthenticated, adjacent attacker to cause an IPv6 flood on the management interface network of an affected device.
What is the severity level of CVE-2021-1268?
The severity level of CVE-2021-1268 is high.
Which versions of Cisco IOS XR Software are affected by CVE-2021-1268?
Cisco IOS XR Software versions up to 7.2.2 are affected by CVE-2021-1268.
How can I fix CVE-2021-1268?
To fix CVE-2021-1268, it is recommended to upgrade Cisco IOS XR Software to version 7.3.0 or later.
Where can I find more information about CVE-2021-1268?
More information about CVE-2021-1268 can be found in the Cisco Security Advisory: [link](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xripv6-spJem78K).
- collector/nvd-index
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/author
- agent/weakness
- agent/severity
- agent/references
- agent/title
- agent/last-modified-date
- agent/tags
- agent/first-publish-date
- agent/event
- agent/description
- vendor/cisco
- canonical/cisco ios xr
- version/cisco ios xr/7.1.0
- version/cisco ios xr/7.2.0
- version/cisco ios xr/7.3.0
- canonical/cisco ncs 1001
- canonical/cisco ncs 1002