A vulnerability in the detection engine parsing of IPv6 packets for Cisco Firepower System Software could allow an unauthenticated, remote attacker to cause high CPU utilization or to cause a denial of service (DoS) condition because the Snort process restarts unexpectedly.
The vulnerability is due to improper input validation of the fields in the IPv6 extension header packet.

An attacker could exploit this vulnerability by sending a malicious IPv6 packet to the detection engine on the targeted device.

An exploit could allow the attacker to cause a DoS condition if the Snort process restarts and traffic inspection is bypassed or traffic is dropped.

This vulnerability is specific to IPv6 traffic only.
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-20171004-fpsnort

Security Impact Rating: High

CVE: CVE-2017-12244

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