#VU11358 Data handling in Cisco IOS XE - CVE-2018-0157

Vulnerability identifier: #VU11358

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-0157

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 Zone-Based Firewall code due to improper handling of fragmented packets. A remote attacker can send fragmented IP Version 4 or IP Version 6 packets and cause the service to crash.

Mitigation
Update to versions 16.6.2, 16.5.2, 16.5(1.132) or 16.4(2.116).

Vulnerable software versions

Cisco IOS XE: 16.4.1

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External links
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-fwip

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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.