Executive Summary

Title Cisco NX-OS Border Gateway Protocol Denial of Service Vulnerability
Name cisco-sa-20161005-bgp First vendor Publication 2016-10-05
Vendor Cisco Last vendor Modification 2016-10-05
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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A vulnerability in the Border Gateway Protocol (BGP) implementation of Cisco NX-OS System Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition due to the device unexpectedly reloading.

The vulnerability is due to incomplete input validation of the BGP update messages. An attacker could exploit this vulnerability by sending a crafted BGP update message to the targeted device. An exploit could allow the attacker to cause the switch to reload unexpectedly.

The Cisco implementation of the BGP protocol only accepts incoming BGP traffic from explicitly defined peers. To exploit this vulnerability, an attacker must be able to send the malicious packets over a TCP connection that appears to come from a trusted BGP peer, or inject malformed messages into the victim's BGP network. This would require obtaining information about the BGP peers in the affected system's trusted network.

The vulnerability may be triggered when the router receives a malformed BGP message from a peer on an existing BGP session. At least one BGP neighbor session must be established for a router to be vulnerable.

If all BGP peers to the NX-OS Software are Cisco IOS, IOS-XE, or IOS-XR devices and those devices are not configured for Cisco Multicast VPN (MVPN) interautonomous system support, this vulnerability cannot be remotely exploited.

Cisco has released software updates that address this vulnerability. Workarounds that address this vulnerability are not available.

This advisory is available at the following link:


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Original Source

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

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-20 Improper Input Validation

CPE : Common Platform Enumeration

Application 633
Os 633

Snort® IPS/IDS

Date Description
2016-10-06 Cisco NX-OS malformed BGP UPDATE denial of service attempt
RuleID : 40343 - Revision : 1 - Type : SERVER-OTHER

Alert History

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Date Informations
2016-10-14 00:25:22
  • Multiple Updates
2016-10-06 17:25:22
  • Multiple Updates
2016-10-05 21:21:59
  • First insertion