Vulnerability identifier: #VU11360

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-2018-0154

CWE-ID: CWE-19

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 crypto engine of the Cisco Integrated Services Module for VPN (ISM-VPN) due to insufficient handling of VPN traffic. A remote attacker can send specially crafted VPN traffic and cause the service to crash.

Mitigation
Update to versions 15.7(3.1.8A)OT, 15.7(3.1.4A)OT, 15.7(2.0k)M, 15.6(3)M3, 15.6(3)M2.2, 15.6(2)T3, 15.5(3)M6 or 15.4(3)M8.

Vulnerable software versions

Cisco IOS XE: All versions

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

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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.