Cisco IOS XR Denial-of-Service Vulnerability

["US-CERT" <US-CERT () ncas us-cert gov>]

NCCIC / US-CERT

National Cyber Awareness System:

Cisco IOS XR Denial-of-Service Vulnerability [ 
https://www.us-cert.gov/ncas/current-activity/2015/06/11/Cisco-IOS-XR-Denial-Service-Vulnerability ] 06/11/2015 05:24 
PM EDT 
Original release date: June 11, 2015

Cisco has identified a vulnerability that could allow an unauthenticated remote attacker to cause a denial-of-service 
condition. The vulnerability is due to improper processing of malformed IPv6 packets carrying extension headers. A 
Cisco Carrier Routing System 3 (CRS-3) running a version of Cisco IOS XR software prior to 4.2.1 is affected by this 
vulnerability.

Users and administrators are encouraged to review the Cisco Security Advisory [ 
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150611-iosxr ] and apply the necessary 
updates.

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