CVE-2020-3479

CVSS V2 High 7.8 CVSS V3 High 7.5
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.
Overview
  • CVE ID
  • CVE-2020-3479
  • Assigner
  • ykramarz@cisco.com
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2020-09-24T18:15:20
  • Last Modified Date
  • 2021-10-07T20:11:30
Weakness Enumerations
CWE URL
CWE-400 http://cwe.mitre.org/data/definitions/400.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
AND
cpe:2.3:o:cisco:ios:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:cisco:ios_xe:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:h:cisco:1100_integrated_services_router:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:4221_integrated_services_router:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:4321_integrated_services_router:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:4331_integrated_services_router:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:4351_integrated_services_router:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:4431_integrated_services_router:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:4451-x_integrated_services_router:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:4461_integrated_services_router:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_1001-hx:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_1001-x:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_1002-hx:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_1002-x:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_1004:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_1006:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_1006-x:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_1009-x:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_1013:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:cloud_services_router_1000v:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:isr_1100:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:isr_1101:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:isr_1109:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:isr_1111x:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:isr_111x:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:isr_1120:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:isr_1160:-:*:*:*:*:*:*:* 0 OR
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:N/AC:L/Au:N/C:N/I:N/A:C
  • Access Vector
  • NETWORK
  • Access Compatibility
  • LOW
  • Authentication
  • NONE
  • Confidentiality Impact
  • NONE
  • Integrity Impact
  • NONE
  • Availability Impact
  • COMPLETE
  • Base Score
  • 7.8
  • Severity
  • HIGH
  • Exploitability Score
  • 10
  • Impact Score
  • 6.9
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • Attack Vector
  • NETWORK
  • Attack Compatibility
  • LOW
  • Privileges Required
  • NONE
  • User Interaction
  • NONE
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • NONE
  • Availability Impact
  • HIGH
  • Base Score
  • 7.5
  • Base Severity
  • HIGH
  • Exploitability Score
  • 3.9
  • Impact Score
  • 3.6
References
Reference URL Reference Tags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-bgp-evpn-dos-LNfYJxfF Vendor Advisory
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2020-3479
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3479
History
Created Old Value New Value Data Type Notes
2022-05-10 06:52:05 Added to TrackCVE
2022-12-04 23:18:22 psirt@cisco.com ykramarz@cisco.com CVE Assigner updated
2022-12-04 23:18:22 2020-09-24T18:15Z 2020-09-24T18:15:20 CVE Published Date updated
2022-12-04 23:18:22 2021-10-07T20:11:30 CVE Modified Date updated
2022-12-04 23:18:22 Analyzed Vulnerability Status updated