Vulnerability · Published Sep 24, 2020 · Assigned by cisco

CVE-2020-3479Cisco IOS and IOS XE Software MP-BGP EVPN Denial of Service Vulnerability

Medium 6.1

In plain English

A medium-severity improper input validation in Cisco IOS 15.2(5)E1 from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 66% of all known vulnerabilities).

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)1.1%top 34.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Cisco	Cisco IOS 15.2(5)E1	n/a

Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:H

References

20200924 Cisco IOS and IOS XE Software MP-BGP EVPN Denial of Service Vulnerability vendor-advisory, x_refsource_CISCO