CVE-2020-3479

Cisco IOS and IOS XE Software MP-BGP EVPN Denial of Service Vulnerability

State: Published
Severity: 6.1 Medium
Published: Sep 24, 2020
Updated: Nov 13, 2024
Reserved: Dec 12, 2019

Description

A vulnerability in the implementation of Multiprotocol Border Gateway Protocol (MP-BGP) for the Layer 2 VPN (L2VPN) Ethernet VPN (EVPN) address family in Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to incorrect processing of Border Gateway Protocol (BGP) update messages that contain crafted EVPN attributes. An attacker could exploit this vulnerability by sending BGP update messages with specific, malformed attributes to an affected device. A successful exploit could allow the attacker to cause an affected device to crash, resulting in a DoS condition.

Scores

CVSS	Score	Vector	Source
3.1	6.1 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:H	cisco

Weaknesses

CWE-20

Affected Products

Product	Versions
Cisco IOS 15.2(5)E1Cisco	n/aAffected

References

20200924 Cisco IOS and IOS XE Software MP-BGP EVPN Denial of Service Vulnerabilityvendor-advisory

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