Vulnerability identifier: #VU6158

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-3849

CWE-ID: CWE-20

Exploitation vector: Local network

Exploit availability: No

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

Vendor: Cisco Systems, Inc

Description
The vulnerability allows an unauthenticated, adjacent attacker to cause DoS conditions.

The vulnerability exists in Autonomic Networking Infrastructure (ANI) registrar feature due to incomplete input validation. An attacker can send a specially crafted autonomic network channel discovery packet and cause the affected device to reload.

Successful exploitation of the vulnerability results in denial of service on the vulnerable device.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Cisco IOS: 15.2.2 ea - 15.6.2 SP

Cisco IOS XE: 3.7 - 3.18

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170320-ani

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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 local network (LAN).

Is there known malware, which exploits this vulnerability?

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