CVE-2019-16020

CVSS V2 Medium 5 CVSS V3 High 8.6
Description
Multiple vulnerabilities in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerabilities are due to incorrect processing of BGP update messages that contain crafted EVPN attributes. An attacker could exploit these vulnerabilities by sending BGP EVPN update messages with malformed attributes to be processed by an affected system. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. To exploit these vulnerabilities, the malicious BGP update message would need to come from a configured, valid BGP peer, or would need to be injected by the attacker into the victim's BGP network on an existing, valid TCP connection to a BGP peer.
Overview
  • CVE ID
  • CVE-2019-16020
  • Assigner
  • ykramarz@cisco.com
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2020-01-26T05:15:16
  • Last Modified Date
  • 2020-01-29T18:16:53
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_xr:6.6.1:*:*:*:*:*:*:* 1 OR
cpe:2.3:h:cisco:asr_9000v:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9001:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9901:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:ncs_540:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5501:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5501-se:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5502:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5502-se:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5508:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5516:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_6000:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:cisco:ios_xr:6.6.2:*:*:*:*:*:*:* 1 OR
cpe:2.3:h:cisco:asr_9000v:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_9000v:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9001:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_9001:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9901:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_9901:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:crs:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5501:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5501-se:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5502:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5502-se:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5508:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5516:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:xrv_9000:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:cisco:ios_xr:6.6.25:*:*:*:*:*:*:* 1 OR
cpe:2.3:h:cisco:ncs_540:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_540l:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5501:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5501-se:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5502:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5502-se:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5508:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5516:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_560:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_6000:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:cisco:ios_xr:7.0.1:*:*:*:*:*:*:* 1 OR
cpe:2.3:h:cisco:asr_9000v:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9001:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9901:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:x64:* 0 OR
cpe:2.3:h:cisco:ncs_1001:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_1002:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_1004:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5001:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5002:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_540:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_540l:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5501:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5501-se:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5502:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5502-se:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5508:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_5516:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_560:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:ncs_6000:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:xrv_9000:-:*:*:*:*:*:*:* 0 OR
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:N/AC:L/Au:N/C:N/I:N/A:P
  • Access Vector
  • NETWORK
  • Access Compatibility
  • LOW
  • Authentication
  • NONE
  • Confidentiality Impact
  • NONE
  • Integrity Impact
  • NONE
  • Availability Impact
  • PARTIAL
  • Base Score
  • 5
  • Severity
  • MEDIUM
  • Exploitability Score
  • 10
  • Impact Score
  • 2.9
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
  • Attack Vector
  • NETWORK
  • Attack Compatibility
  • LOW
  • Privileges Required
  • NONE
  • User Interaction
  • NONE
  • Scope
  • CHANGED
  • Confidentiality Impact
  • NONE
  • Availability Impact
  • HIGH
  • Base Score
  • 8.6
  • Base Severity
  • HIGH
  • Exploitability Score
  • 3.9
  • Impact Score
  • 4
References
Reference URL Reference Tags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-evpn Vendor Advisory
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2019-16020
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-16020
History
Created Old Value New Value Data Type Notes
2022-05-10 16:52:09 Added to TrackCVE
2022-12-04 10:07:47 psirt@cisco.com ykramarz@cisco.com CVE Assigner updated
2022-12-04 10:07:48 2020-01-26T05:15Z 2020-01-26T05:15:16 CVE Published Date updated
2022-12-04 10:07:48 2020-01-29T18:16:53 CVE Modified Date updated
2022-12-04 10:07:48 Analyzed Vulnerability Status updated