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Category:   Device (Router/Bridge/Hub)  >   Cisco IOS Vendors:   Cisco
Cisco IOS DHCPv6 Bug Lets Remote Users Deny Service
SecurityTracker Alert ID:  1027577
SecurityTracker URL:
CVE Reference:   CVE-2012-4623   (Links to External Site)
Date:  Sep 26 2012
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Cisco IOS. A remote user can cause denial of service conditions.

A remote user can send specially crafted data to cause the target device to reload.

Cisco has assigned Cisco bug ID CSCto57723 to this vulnerability.

Systems with the DHCP version 6 (DHCPv6) server feature enabled are affected.

DHCP servers for IPv4 are not affected.

Cisco IOS and IOS XE are affected.

Cisco IOS XR Software is not affected.

Impact:   A remote user can cause the target device to reload.
Solution:   The vendor has issued a fix.

A patch matrix is available in the vendor's advisory.

The vendor's advisory is available at:

Vendor URL: (Links to External Site)
Cause:   State error

Message History:   None.

 Source Message Contents

Date:  Wed, 26 Sep 2012 12:18:34 -0400
Subject:  Cisco Security Advisory: Cisco IOS Software DHCP Version 6 Denial of Service Vulnerability

Hash: SHA256

Cisco IOS Software DHCP Version 6 Server Denial of Service Vulnerability

Advisory ID: cisco-sa-20120926-dhcpv6

Revision 1.0

For Public Release 2012 September 26 16:00  UTC (GMT)


Cisco IOS Software and Cisco IOS XE Software contain a vulnerability
that could allow an unauthenticated, remote attacker to cause a denial
of service (DoS) condition. An attacker could exploit this
vulnerability by sending a crafted request to an affected device that
has the DHCP version 6 (DHCPv6) server feature enabled, causing a

Cisco has released free software updates that address 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:

Version: GnuPG/MacGPG2 v2.0.18 (Darwin)
Comment: GPGTools -

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