$ cve CVE-2017-12319 JSON

CVE-2017-12319 KEV

5.9

MEDIUM · CVSS 3.1 · EPSS 5.2% (pctl 92)

Patch first

On CISA KEV — known exploited in the wild, due 2022-03-24.

Description

A vulnerability in the Border Gateway Protocol (BGP) over an Ethernet Virtual Private Network (EVPN) for Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload, resulting in a denial of service (DoS) condition, or potentially corrupt the BGP routing table, which could result in network instability. The vulnerability exists due to changes in the implementation of the BGP MPLS-Based Ethernet VPN RFC (RFC 7432) draft between IOS XE software releases. When the BGP Inclusive Multicast Ethernet Tag Route or BGP EVPN MAC/IP Advertisement Route update packet is received, it could be possible that the IP address length field is miscalculated. An attacker could exploit this vulnerability by sending a crafted BGP packet to an affected device after the BGP session was established. An exploit could allow the attacker to cause the affected device to reload or corrupt the BGP routing table; either outcome would result in a DoS. The vulnerability may be triggered when the router receives a crafted BGP message from a peer on an existing BGP session. This vulnerability affects all releases of Cisco IOS XE Software prior to software release 16.3 that support BGP EVPN configurations. If the device is not configured for EVPN, it is not vulnerable. Cisco Bug IDs: CSCui67191, CSCvg52875.

Scoring

CVSS	5.9 (MEDIUM, v3.1)
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS	5.24% — more likely to be exploited than 92% of all CVEs
Weakness	CWE-20
On CISA KEV	yes — remediate by 2022-03-24
Public exploit	none known
Published	2018-03-27
Last modified	2026-06-17

CISA KEV

Name	Cisco IOS XE Software Ethernet Virtual Private Network Border Gateway Protocol Denial-of-Service Vulnerability
Added	2022-03-03
Due	2022-03-24
Vendor / product	Cisco / IOS XE Software
Ransomware use	none reported

Affected (40)

Vendor	Product
cisco	1000 integrated services router
cisco	1100 integrated services router
cisco	1100-4g integrated services router
cisco	1100-4g\/6g integrated services router
cisco	1100-4gltegb integrated services router
cisco	1100-4gltena integrated services router
cisco	1100-4p integrated services router
cisco	1100-6g integrated services router
cisco	1100-8p integrated services router
cisco	1100-lte integrated services router
cisco	1101 integrated services router
cisco	1101-4p integrated services router
cisco	1109 integrated services router
cisco	1109-2p integrated services router
cisco	1109-4p integrated services router
cisco	1111x integrated services router
cisco	1111x-8p integrated services router
cisco	111x integrated services router
cisco	1120 integrated services router
cisco	1131 integrated services router
cisco	1160 integrated services router
cisco	1801 integrated service router
cisco	1802 integrated service router
cisco	1803 integrated service router
cisco	1811 integrated service router
cisco	1812 integrated service router
cisco	1841 integrated service router
cisco	1861 integrated service router
cisco	1905 integrated services router
cisco	1906c integrated services router
cisco	1921 integrated services router
cisco	1941 integrated services router
cisco	1941w integrated services router
cisco	4000 integrated services router
cisco	422 integrated services router
cisco	4221 integrated services router
cisco	4321\/k9-rf integrated services router
cisco	4321\/k9-ws integrated services router
cisco	ios
cisco	ios xe

References

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