Executive Summary

Title Cisco IOS Software Malformed Border Gateway Protocol Attribute Vulnerability
Name cisco-sa-20120926-bgp First vendor Publication 2012-09-26
Vendor Cisco Last vendor Modification 2012-09-26
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
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Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:M/Au:N/C:N/I:N/A:C)
Cvss Base Score 7.1 Attack Range Network
Cvss Impact Score 6.9 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
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Cisco IOS 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. This advisory is available at the following link:


Note: The September 26, 2012, Cisco IOS Software Security Advisory bundled publication includes 9 Cisco Security Advisories. Eight of the advisories address vulnerabilities in Cisco IOS Software, and one advisory addresses a vulnerability in Cisco Unified Communications Manager. Each Cisco IOS Software Security Advisory lists the Cisco IOS Software releases that correct the vulnerability or vulnerabilities detailed in the advisory as well as the Cisco IOS Software releases that correct all Cisco IOS Software vulnerabilities in the September 2012 bundled publication.

Individual publication links are in "Cisco Event Response: Semi-Annual Cisco IOS Software Security Advisory Bundled Publication" at the following link:


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CWE : Common Weakness Enumeration

% Id Name
100 % CWE-20 Improper Input Validation

CPE : Common Platform Enumeration

Os 1
Os 2
Os 6

Nessus® Vulnerability Scanner

Date Description
2013-12-14 Name : The remote device is missing a vendor-supplied security patch.
File : cisco-sa-20120926-bgp-iosxr.nasl - Type : ACT_GATHER_INFO
2012-09-28 Name : The remote device is missing a vendor-supplied security patch.
File : cisco-sa-20120926-bgp.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2014-02-17 10:22:05
  • Multiple Updates
2013-02-06 19:08:00
  • Multiple Updates