Cisco Security Advisory - Cisco IOS and IOS XE Software ARP Resource Management Exhaustion Denial of Service Vulnerability

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Cisco IOS and IOS XE Software ARP Resource Management Exhaustion Denial of Service Vulnerability

A vulnerability in Address Resolution Protocol (ARP) management of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to prevent an affected device from resolving ARP entries for legitimate hosts on the connected subnets.

This vulnerability exists because ARP entries are mismanaged. An attacker could exploit this vulnerability by continuously sending traffic that results in incomplete ARP entries. A successful exploit could allow the attacker to cause ARP requests on the device to be unsuccessful for legitimate hosts, resulting in a denial of service (DoS) condition.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-arp-mtfhBfjE

     
         
Security Impact Rating:  Medium
   
   
       
CVE: CVE-2021-1377
Source: Cisco IOS and IOS XE Software ARP Resource Management Exhaustion Denial of Service Vulnerability