CVE-2017-3849

A vulnerability in the Autonomic Networking Infrastructure (ANI) registrar feature of Cisco IOS Software (possibly 15.2 through 15.6) and Cisco IOS XE Software (possibly 3.7 through 3.18, and 16) could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition. The vulnerability is due to incomplete input validation on certain crafted packets. An attacker could exploit this vulnerability by sending a crafted autonomic network channel discovery packet to a device that has all the following characteristics: (1) running a Cisco IOS Software or Cisco IOS XE Software release that supports the ANI feature; (2) configured as an autonomic registrar; (3) has a whitelist configured. An exploit could allow the attacker to cause the affected device to reload. Note: Autonomic networking should be configured with a whitelist. Do not remove the whitelist as a workaround. Cisco Bug IDs: CSCvc42717.

• CWE-20
• CWE-20

• http://www.securityfocus.com/bid/96972Third Party Advisory, VDB Entry
• http://www.securitytracker.com/id/1038064
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170320-aniVendor Advisory
• http://www.securityfocus.com/bid/96972Third Party Advisory, VDB Entry
• http://www.securitytracker.com/id/1038064
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170320-aniVendor Advisory

Published

Mar 21, 2017

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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