CVE-2020-3479

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

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.

Categories

6.1
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.39%
Vendor Advisory cisco.com
Affected: Cisco Cisco IOS 15.2(5)E1
Published at:
Updated at:

References

Link Tags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-bgp-evpn-dos-LNfYJxfF vendor advisory

Frequently Asked Questions

What is the severity of CVE-2020-3479?
CVE-2020-3479 has been scored as a medium severity vulnerability.
How to fix CVE-2020-3479?
To fix CVE-2020-3479, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-3479 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2020-3479 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-3479?
CVE-2020-3479 affects Cisco Cisco IOS 15.2(5)E1.
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