CVE-2020-3421

CVSS V2 High 7.1 CVSS V3 High 7.5
Description
Multiple vulnerabilities in the Zone-Based Firewall feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload or stop forwarding traffic through the firewall. The vulnerabilities are due to incomplete handling of Layer 4 packets through the device. An attacker could exploit these vulnerabilities by sending a certain sequence of traffic patterns through the device. A successful exploit could allow the attacker to cause the device to reload or stop forwarding traffic through the firewall, resulting in a denial of service. For more information about these vulnerabilities, see the Details section of this advisory.
Overview
  • CVE ID
  • CVE-2020-3421
  • Assigner
  • ykramarz@cisco.com
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2020-09-24T18:15:18
  • Last Modified Date
  • 2020-10-09T01:13:08
Weakness Enumerations
CWE URL
CWE-754 http://cwe.mitre.org/data/definitions/754.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
AND
cpe:2.3:o:cisco:ios_xe:16.9.3:*:*:*:*:*:*:* 1 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:isr_4221:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:isr_4321:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:isr_4331:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:isr_4351:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:isr_4431:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:isr_4461:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:cisco:ios_xe:17.2:*:*:*:*:*:*:* 1 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:csr_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
cpe:2.3:h:cisco:isr_4221:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:isr_4331:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:isr_4431:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:cisco:isr_4461:-:*:*:*:*:*:*:* 0 OR
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:N/AC:M/Au:N/C:N/I:N/A:C
  • Access Vector
  • NETWORK
  • Access Compatibility
  • MEDIUM
  • Authentication
  • NONE
  • Confidentiality Impact
  • NONE
  • Integrity Impact
  • NONE
  • Availability Impact
  • COMPLETE
  • Base Score
  • 7.1
  • Severity
  • HIGH
  • Exploitability Score
  • 8.6
  • 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-zbfw-94ckG4G Vendor Advisory
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2020-3421
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3421
History
Created Old Value New Value Data Type Notes
2022-05-10 17:09:35 Added to TrackCVE
2022-12-04 23:17:29 psirt@cisco.com ykramarz@cisco.com CVE Assigner updated
2022-12-04 23:17:29 2020-09-24T18:15Z 2020-09-24T18:15:18 CVE Published Date updated
2022-12-04 23:17:29 2020-10-09T01:13:08 CVE Modified Date updated
2022-12-04 23:17:29 Analyzed Vulnerability Status updated