Vulnerability identifier: #VU12091

Vulnerability risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-0228

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco ASA 5500-X Series
Hardware solutions / Security hardware applicances

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 ingress flow creation functionality due to incorrect handling of an internal software lock that can prevent other system processes from getting CPU cycles, causing a high CPU condition. A remote attacker can send a steady stream of malicious IP packets that can cause connections to be created, exhaust CPU resources and cause the service to crash.

Mitigation
Update to versions 201.1(15.1), 201.1(14.4), 201.1(1.82), 101.2(1.20), 100.13(0.171), 100.11(0.87), 100.8(40.140), 99.1(20.127), 98.2(10.4), 98.2(0.5), 97.1(0.167), 96.2(0.151), 9.9(0.152), 9.8(2.12), 9.7(1.16), 9.6(4), 9.6(3.236), 9.6(3.16), 9.4(4.13), 9.2(4.26), 9.1(7.232) or 9.1(7.20).

Vulnerable software versions

Cisco ASA 5500-X Series: 98.1.12.187

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa2

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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?

No. We are not aware of malware exploiting this vulnerability.