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AUSCERT External Security Bulletin Redistribution
Cisco IOS XE Software IP Header Sanity Check Denial of
29 November 2013
AusCERT Security Bulletin Summary
Product: Cisco IOS XE Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2013-6706
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Cisco Security Notice
Cisco IOS XE Software IP Header Sanity Check Denial of Service Vulnerability
CVE ID: CVE-2013-6706
Release Date: 2013 November 27 22:58 UTC (GMT)
Last Updated: 2013 November 27 22:58 UTC (GMT)
A vulnerability in the Cisco Express Forwarding processing module that checks
the sanity of IP headers on Cisco IOS XE Software could allow an
unauthenticated, remote attacker to cause an affected device to reload,
leading to a denial of service (DoS) condition.
The vulnerability is due to improper processing of Multiprotocol Label
Switching (MPLS) packets. When certain additional features are configured, an
attacker could exploit this vulnerability by sending MPLS packets to traverse
and exit an affected device as IP packets. An exploit could allow the attacker
to cause the device to reload, leading to a DoS condition.
Product More Information CVSS
Cisco IOS XE Software CSCuj23992 5.4/4.5
What Is a Cisco Security Notice?
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Security Notices to inform customers of low- to mid-level severity security
issues involving Cisco products.
Customers who wish to upgrade to a software version that includes fixes for
these issues should contact their normal support channels. Free software
updates will not be provided for issues that are disclosed through a Cisco
For additional information about Cisco PSIRT publications, see the Cisco
Security Vulnerability Policy at
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organizations to ensure that any applied workaround or fix is the most
appropriate in the intended network before it is deployed.
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