A vulnerability in the Multiprotocol Label Switching (MPLS) IP fragmentation function of Cisco IOS XE could allow an unauthenticated, remote attacker to cause the Cisco Packet Processor to crash. The vulnerability is due to input validation processing of the crafted MPLS IP packets. An attacker could exploit this vulnerability by injecting specifically crafted MPLS IP packets that are subject to MPLS fragmentation. An exploit could allow the attacker to cause the Cisco Packet Processor process to crash in Cisco IOS XE software. Cisco has confirmed the vulnerability in a security notice and released software updates. To exploit this vulnerability, it is likely that an attacker would need access to trusted, internal networks to send crafted MPLS IP packets to the targeted device to be processed. This access requirement may reduce the likelihood of a successful exploit. Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
| Version | Description | Section | Status | Date |
| 1.0 | Initial Release | NA | Final | 2013-Dec-24 |
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