CVE-2018-15443

Medium

Description

A vulnerability in the detection engine of Cisco Firepower System Software could allow an unauthenticated, remote attacker to bypass a configured Intrusion Prevention System (IPS) rule that inspects certain types of TCP traffic. The vulnerability is due to incorrect TCP retransmission handling. An attacker could exploit this vulnerability by sending a crafted TCP connection request through an affected device. A successful exploit could allow the attacker to bypass configured IPS rules and allow uninspected traffic onto the network.

SeverityMedium

CVSS5.8

Exploit probability86. percentile2.8%

Product

Cisco Firepower System Software

PublishedNov 8, 2018

First seenNov 8, 2018

Weakness typeCWE-400Uncontrolled resource consumption

How to fix

Vendor advisories

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181107-fde-tcp-bypass

Affected products

Product	Affected versions	Fixed in
cisco firepower_system_software	No range specified	—

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