The DHCP relay subsystem of Cisconbsp;IOS and Cisconbsp;IOS XE Software contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code and gain full control of an affected system.

The attacker could also cause an affected system to reload, resulting in a denial of servicenbsp;(DoS) condition.
The vulnerability is due to a buffer overflow condition in the DHCP relay subsystem of the affected software.

An attacker could exploit this vulnerability by sending a crafted DHCP Version 4nbsp;(DHCPv4) packet to an affected system.

A successful exploit could allow the attacker to execute arbitrary code and gain full control of the affected system or cause the affected system to reload, resulting in a 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:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-dhcp
This advisory is part of the September 27, 2017, release of the Cisconbsp;IOS and IOSnbsp;XE Software Security Advisory Bundled Publication, which includes 12 Cisco Security Advisories that describe 13 vulnerabilities.

For a complete list of the advisories and links to them, see Cisco Event Response: September 2017 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication.

Security Impact Rating: Critical

CVE: CVE-2017-12240

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