Cisco IOS Software MP BGP EVPN DoS (cisco-sa-ios-bgp-evpn-dos-LNfYJxfF)

high Nessus Plugin ID 141231
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VPR Score: 3.6


The remote device is missing a vendor-supplied security patch.


According to its self-reported version, IOS is affected by a denial of service (DoS) vulnerability in the Multiprotocol Border Gateway Protocol (MP-BGP) for the Layer 2 VPN (L2VPN) Ethernet VPN (EVPN) address family. An unauthenticated, remote attacker can exploit this, by sending BGP update messages with specific, malformed attributes to an affected device, to cause the device to crash.


Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvr81264 and CSCvr83128

See Also

Plugin Details

Severity: High

ID: 141231

File Name: cisco-sa-ios-bgp-evpn-dos-LNfYJxfF-ios.nasl

Version: 1.11

Type: combined

Family: CISCO

Published: 10/7/2020

Updated: 4/19/2021

Dependencies: cisco_ios_version.nasl

Risk Information

Risk Factor: High

VPR Score: 3.6

CVSS Score Source: CVE-2020-3479

CVSS v2.0

Base Score: 7.8

Temporal Score: 5.8

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:ios

Required KB Items: Host/Cisco/IOS/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 9/24/2020

Vulnerability Publication Date: 9/24/2020

Reference Information

CVE: CVE-2020-3479

CISCO-BUG-ID: CSCvr81264, CSCvr83128

CISCO-SA: cisco-sa-ios-bgp-evpn-dos-LNfYJxfF

IAVA: 2020-A-0439

CWE: 20