Vulnerability Details CVE-2020-3421
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.011
EPSS Ranking 76.9%
CVSS Severity
CVSS v3 Score 8.6
CVSS v2 Score 7.1
References
Products affected by CVE-2020-3421
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cpe:2.3:h:cisco:1100_integrated_services_router:-
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cpe:2.3:h:cisco:1101_integrated_services_router:-
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cpe:2.3:h:cisco:1109_integrated_services_router:-
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cpe:2.3:h:cisco:1111x_integrated_services_router:-
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cpe:2.3:h:cisco:111x_integrated_services_router:-
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cpe:2.3:h:cisco:1120_integrated_services_router:-
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cpe:2.3:h:cisco:1160_integrated_services_router:-
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cpe:2.3:h:cisco:4221_integrated_services_router:-
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cpe:2.3:h:cisco:4321_integrated_services_router:-
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cpe:2.3:h:cisco:4331_integrated_services_router:-
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cpe:2.3:h:cisco:4351_integrated_services_router:-
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cpe:2.3:h:cisco:4431_integrated_services_router:-
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cpe:2.3:h:cisco:4461_integrated_services_router:-
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cpe:2.3:h:cisco:asr_1001-hx:-
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cpe:2.3:h:cisco:asr_1001-x:-
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cpe:2.3:h:cisco:asr_1002-hx:-
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cpe:2.3:h:cisco:asr_1002-x:-
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cpe:2.3:h:cisco:asr_1004:-
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cpe:2.3:h:cisco:asr_1006-x:-
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cpe:2.3:h:cisco:asr_1006:-
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cpe:2.3:h:cisco:asr_1009-x:-
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cpe:2.3:h:cisco:asr_1013:-
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cpe:2.3:h:cisco:csr_1000v:-
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cpe:2.3:o:cisco:ios_xe:16.9.3
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cpe:2.3:o:cisco:ios_xe:17.2