Cisco IOS XR Software Malformed Border Gateway Protocol Attribute Vulnerability (cisco-sa-20120926-bgp)

high Nessus Plugin ID 71436


The remote device is missing a vendor-supplied security patch.


Cisco IOS XR Software contains a vulnerability in the Border Gateway Protocol (BGP) routing protocol feature. The vulnerability can be triggered when the router receives a malformed attribute from a peer on an existing BGP session. Successful exploitation of this vulnerability can cause all BGP sessions to reset. Repeated exploitation may result in an inability to route packets to BGP neighbors during reconvergence times. Cisco has released free software updates that address this vulnerability. There are no workarounds for this vulnerability.


Apply the relevant patch referenced in Cisco Security Advisory cisco-sa-20120926-bgp.

See Also

Plugin Details

Severity: High

ID: 71436

File Name: cisco-sa-20120926-bgp-iosxr.nasl

Version: 1.7

Type: combined

Family: CISCO

Published: 12/14/2013

Updated: 4/8/2021

Supported Sensors: Nessus

Risk Information


Risk Factor: Low

Score: 3.4


Risk Factor: High

Base Score: 7.1

Temporal Score: 5.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2012-4617

Vulnerability Information

CPE: cpe:/o:cisco:ios_xr

Required KB Items: Host/Cisco/IOS-XR/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 10/4/2012

Vulnerability Publication Date: 9/26/2012

Reference Information

CVE: CVE-2012-4617

BID: 55694

CISCO-SA: cisco-sa-20120926-bgp