CVE-2017-3849
HighSummary
A vulnerability in the Autonomic Networking Infrastructure (ANI) registrar feature of Cisco IOS and Cisco IOS XE software could allow an unauthenticated attacker to cause a denial of service (DoS) condition. The issue is due to incomplete input validation on certain crafted packets.
Risk Assessment
An attacker could exploit this vulnerability to reload the affected device, leading to service availability interruptions. This could impact the operational continuity of the organization and its network infrastructure.
Recommendation
It is recommended that devices be configured with a whitelist enabled and not to remove it as a workaround. Additionally, monitoring and updating the software to the latest versions is advised to minimize risk.
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Original NVD description (English source)
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.

