Executive Summary

Title Cisco IOS XR Software BVI Routed Packet Denial of Service Vulnerability
Name cisco-sa-20150415-iosxr First vendor Publication 2015-04-15
Vendor Cisco Last vendor Modification 2015-04-15
Severity (Vendor) N/A Revision 1.0

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:N/I:N/A:C)
Cvss Base Score 7.8 Attack Range Network
Cvss Impact Score 6.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


A vulnerability in the packet-processing code of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers (ASR) could allow an unauthenticated, remote attacker to cause a lockup and eventual reload of a network processor chip and the line card that is processing traffic. Only Typhoon-based line cards on Cisco ASR 9000 Series Aggregation Services Routers are affected by this vulnerability.

The vulnerability is due to improper processing of packets that are routed via the bridge-group virtual interface (BVI) when any of the following features are configured: Unicast Reverse Path Forwarding (uRPF), policy-based routing (PBR), quality of service (QoS), or access control lists (ACLs). An attacker could exploit this vulnerability by sending IPv4 packets through an affected device that is configured to route them via the BVI interface. A successful exploit could allow the attacker to cause a lockup and eventual reload of a network processor chip and the line card that is processing traffic, leading to a denial of service (DoS) condition.

Cisco has released free software updates that address this vulnerability. There are no workarounds to address this vulnerability.

This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150415-iosxr

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Original Source

Url : http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco (...)

CWE : Common Weakness Enumeration

% Id Name
50 % CWE-399 Resource Management Errors
50 % CWE-19 Data Handling

CPE : Common Platform Enumeration

Os 9

Information Assurance Vulnerability Management (IAVM)

Date Description
2015-04-23 IAVM : 2015-B-0052 - Cisco IOS XR Software Denial of Service Vulnerability
Severity : Category I - VMSKEY : V0060015

Nessus® Vulnerability Scanner

Date Description
2015-04-24 Name : The remote device is missing a vendor-supplied security patch.
File : cisco-sa-20150415-iosxr.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2015-10-18 17:22:09
  • Multiple Updates
2015-04-25 13:29:30
  • Multiple Updates
2015-04-18 00:29:55
  • Multiple Updates
2015-04-15 21:26:07
  • First insertion