CVE-2019-16018

published 2020-01-26

CVE-2019-16018: A vulnerability in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an…

Priority P4 29 medium 6.5 CVSS 3.1

AV N AC L PR N UI R S U C N I N A H

A vulnerability in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to incorrect processing of a BGP update message that contains crafted EVPN attributes. An attacker could indirectly exploit the vulnerability by sending BGP EVPN update messages with a specific, malformed attribute to an affected system and waiting for a user on the device to display the EVPN operational routes’ status. If successful, the attacker could cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. To exploit this vulnerability, the malicious BGP update message would need to come from a configured, valid BGP peer, or would need to be injected by the attacker into the victim's BGP network on an existing, valid TCP connection to a BGP peer.

Affected

6 ranges

Vendor	Product	Version range	Fixed in
cisco	cisco_ios_xr_software	>= unspecified < n/a	n/a
cisco	ios_xr	—	—
cisco	ios_xr	—	—
cisco	ios_xr	—	—
cisco	ios_xr	—	—
cisco	ios_xr	—	—

CVSS provenance

nvd v3.1 6.5 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

nvd v3.0 7.4 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H

nvd v2.0 4.3 MEDIUM AV:N/AC:M/Au:N/C:N/I:N/A:P

vendor_cisco 7.4 HIGH

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