Vulnerability identifier: #VU11356

Vulnerability risk: Medium

CVSSv3.1: 8.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2018-0158

CWE-ID: CWE-401

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco IOS XE
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

Description
The vulnerability allows a remote unauthenticated attacker to cause DoS condition on the target system.

The weakness exists in the Internet Key Exchange Version 2 (IKEv2) module due to incorrect processing of certain IKEv2 packets. A remote attacker can send specially crafted IKEv2 packets, trigger memory leak and cause the service to crash.

Mitigation
Update to versions 16.4(2.68), 16.3.5b, 16.3.5, 16.3(4.67), 15.7(3.1.14A)OT, 15.7(3.1.5U)OT, 15.7(3)M1, 15.7(3)M, 15.7(2.0v)M0.2, 15.7(2.0y)M, 15.6(3)M3, 15.6(2.18)S2.23, 15.6(2)T3, 15.6(2)SP3, 15.6(2)S4, 15.6(1.41)SP2, 15.5(3)S6a, 15.5(3)S6, 15.5(3)S5.31, 15.5(3)M6, 15.5(1.0.93)SY1, 15.5(1.0.91)SY1, 15.5(1)SY1, 15.5(1)IA1.428, 15.4(1.1.13)SY3, 15.4(1)SY3, 15.2(6.5.1i)E1, 15.2(6.4.66i)E1, 15.2(6.3.0i)E, 15.2(6.2.20i)E, 15.2(6)E1, 15.2(4.6.22)EA5, 15.2(4)EA6 or 15.2(4)E5.

Vulnerable software versions

Cisco IOS XE: 15.5.3 S1.1 - 15.5.3 S1.12

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-ike

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.