Executive Summary

Title Cisco IOS and IOS XE Software DHCPv6 Relay Denial of Service Vulnerability
Name cisco-sa-20160323-dhcpv6 First vendor Publication 2016-03-23
Vendor Cisco Last vendor Modification 2016-03-23
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 DHCP version 6 (DHCPv6) relay feature of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload.

The vulnerability is due to insufficient validation of DHCPv6 relay messages. An attacker could exploit this vulnerability by sending a crafted DHCPv6 relay message to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition.

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

This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160323-dhcpv6

This advisory is part of the March 23, 2016, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes six Cisco Security Advisories that describe six vulnerabilities. All the vulnerabilities have a Security Impact Rating of "High." For a complete list of advisories and links to them, see Cisco Event Response: http://www.cisco.com/c/en/us/about/security-center/event-response/cisco-erp-march-2016.html

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Original Source

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

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-399 Resource Management Errors

CPE : Common Platform Enumeration

Os 77
Os 1
Os 1
Os 1
Os 1
Os 1

Snort® IPS/IDS

Date Description
2016-03-24 Cisco IOS DHCPv6 relay denial of service attempt
RuleID : 38302 - Revision : 1 - Type : SERVER-OTHER

Nessus® Vulnerability Scanner

Date Description
2016-04-06 Name : The remote device is missing a vendor-supplied security patch.
File : cisco-sa-20160323-dhcpv6-ios.nasl - Type : ACT_GATHER_INFO
2016-04-06 Name : The remote device is missing a vendor-supplied security patch.
File : cisco-sa-20160323-dhcpv6-iosxe.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2016-04-07 13:26:05
  • Multiple Updates
2016-03-29 05:29:01
  • Multiple Updates
2016-03-23 21:21:36
  • First insertion