A vulnerability in the Border Gateway Protocol (BGP) Multicast VPN (MVPN) implementation of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause an affected device to unexpectedly reload, resulting in a denial of service (DoS) condition. The vulnerability is due to incomplete input validation of a specific type of BGP MVPN update message. An attacker could exploit this vulnerability by sending this specific, valid BGP MVPN update message to a targeted device. A successful exploit could allow the attacker to cause one of the BGP-related routing applications to restart multiple times, leading to a system-level restart. Note: The Cisco implementation of BGP accepts incoming BGP traffic from only explicitly configured peers. To exploit this vulnerability, an attacker must send a specific BGP MVPN update message over an established TCP connection that appears to come from a trusted BGP peer. To do so, the attacker must obtain information about the BGP peers in the trusted network of the affected system.

According to its self-reported version, Cisco NX-OS Software is affected by a vulnerability in the Border Gateway Protocol (BGP) Multicast VPN (MVPN) due to incomplete input validation of a specific type of BGP MVPN update. An unauthenticated, remote attacker can exploit this, by sending a specific, valid BGP MVPN update message to a targeted device, in order to cause it to unexpectedly reload, resulting in a denial of service (DoS) condition). 

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Detections

Analytics

CVE-2020-3397

high

Tenable Plugins

high