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MEDIUM · 6.1

CVE-2020-3479

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 c...

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.

CVSS Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:H
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Affected Products

VendorProductVersions
CiscoIos-
CiscoIos Xe-
Cisco1100 Integrated Services Router-
Cisco1101 Integrated Services Router-
Cisco1109 Integrated Services Router-
Cisco1111X Integrated Services Router-
Cisco111X Integrated Services Router-
Cisco1120 Integrated Services Router-
Cisco1160 Integrated Services Router-
Cisco4221 Integrated Services Router-
Cisco4321 Integrated Services Router-
Cisco4331 Integrated Services Router-
Cisco4351 Integrated Services Router-
Cisco4431 Integrated Services Router-
Cisco4451-X Integrated Services Router-
Cisco4461 Integrated Services Router-
CiscoAsr 1001-Hx-
CiscoAsr 1001-X-
CiscoAsr 1002-Hx-
CiscoAsr 1002-X-

Related Weaknesses (CWE)

CWE-20CWE-400

References

FAQ

What is CVE-2020-3479?

CVE-2020-3479 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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 c...

How severe is CVE-2020-3479?

CVE-2020-3479 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2020-3479?

Check the references section above for vendor advisories and patch information. Affected products include: Cisco Ios, Cisco Ios Xe, Cisco 1100 Integrated Services Router, Cisco 1101 Integrated Services Router, Cisco 1109 Integrated Services Router.