ID CVE-2020-3421
Summary 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.
References
Vulnerable Configurations
  • cpe:2.3:o:cisco:ios_xe:16.9.3:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xe:16.9.3:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:4221_integrated_services_router:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:4221_integrated_services_router:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:4321_integrated_services_router:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:4321_integrated_services_router:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:4331_integrated_services_router:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:4331_integrated_services_router:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:4351_integrated_services_router:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:4351_integrated_services_router:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:4431_integrated_services_router:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:4431_integrated_services_router:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:4461_integrated_services_router:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:4461_integrated_services_router:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_1001-hx:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_1001-hx:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_1001-x:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_1001-x:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_1002-hx:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_1002-hx:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_1002-x:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_1002-x:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_1004:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_1004:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_1006:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_1006:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_1006-x:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_1006-x:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_1009-x:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_1009-x:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:asr_1013:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:asr_1013:-:*:*:*:*:*:*:*
  • cpe:2.3:o:cisco:ios_xe:17.2:*:*:*:*:*:*:*
    cpe:2.3:o:cisco:ios_xe:17.2:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:1100_integrated_services_router:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:1100_integrated_services_router:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:1101_integrated_services_router:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:1101_integrated_services_router:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:1109_integrated_services_router:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:1109_integrated_services_router:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:1111x_integrated_services_router:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:1111x_integrated_services_router:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:111x_integrated_services_router:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:111x_integrated_services_router:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:1120_integrated_services_router:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:1120_integrated_services_router:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:1160_integrated_services_router:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:1160_integrated_services_router:-:*:*:*:*:*:*:*
  • cpe:2.3:h:cisco:csr_1000v:-:*:*:*:*:*:*:*
    cpe:2.3:h:cisco:csr_1000v:-:*:*:*:*:*:*:*
CVSS
Base: 7.1 (as of 22-05-2023 - 18:57)
Impact:
Exploitability:
CWE CWE-754
CAPEC
Access
VectorComplexityAuthentication
NETWORK MEDIUM NONE
Impact
ConfidentialityIntegrityAvailability
NONE NONE COMPLETE
cvss-vector via4 AV:N/AC:M/Au:N/C:N/I:N/A:C
refmap via4
cisco 20200924 Cisco IOS XE Software Zone-Based Firewall Denial of Service Vulnerabilities
Last major update 22-05-2023 - 18:57
Published 24-09-2020 - 18:15
Last modified 22-05-2023 - 18:57
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