CVE-2018-0189: A vulnerability in the Forwarding Information Base (FIB) code of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, network attacker…

medium5.3CVSS 3.0

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A vulnerability in the Forwarding Information Base (FIB) code of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, network attacker to cause a denial of service (DoS) condition. The vulnerability is due to a limitation in the way the FIB is internally representing recursive routes. An attacker could exploit this vulnerability by injecting routes into the routing protocol that have a specific recursive pattern. The attacker must be in a position on the network that provides the ability to inject a number of recursive routes with a specific pattern. An exploit could allow the attacker to cause an affected device to reload, creating a DoS condition. Cisco Bug IDs: CSCva91655.

Affected

11 ranges

Vendor	Product	Version range	Fixed in
cisco	ios_and_ios_xe	—	—
cisco	ios_xe	< 15.5\(3\)s5	15.5\(3\)s5
cisco	ios_xe	< 15.5\(3\)m5	15.5\(3\)m5
cisco	ios_xe	< 15.4\(3\)s7	15.4\(3\)s7
cisco	ios_xe	< 15.4\(2\)s1	15.4\(2\)s1
cisco	ios_xe	< 15.4\(1\)s1	15.4\(1\)s1
cisco	ios_xe	< 15.4\(1\)s0a	15.4\(1\)s0a
cisco	ios_xe	< 15.2\(5\)e1	15.2\(5\)e1
cisco	ios_xe	< 15.2\(4\)e5	15.2\(4\)e5
cisco	ios_xe	< 15.2\(2\)e1	15.2\(2\)e1
cisco	ios_xe	< 15.2\(1\)e1	15.2\(1\)e1