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Vulnerable Software

Vulnerability Details CVE-2021-40116

Multiple Cisco products are affected by a vulnerability in Snort rules that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.The vulnerability is due to improper handling of the Block with Reset or Interactive Block with Reset actions if a rule is configured without proper constraints. An attacker could exploit this vulnerability by sending a crafted IP packet to the affected device. A successful exploit could allow the attacker to cause through traffic to be dropped. Note: Only products with Snort3 configured and either a rule with Block with Reset or Interactive Block with Reset actions configured are vulnerable. Products configured with Snort2 are not vulnerable.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.008

EPSS Ranking 72.5%

CVSS Severity

CVSS v3 Score 8.6

CVSS v2 Score 7.1

References

Products affected by CVE-2021-40116

Cisco » Firepower Threat Defense » Version: 6.4.0

cpe:2.3:a:cisco:firepower_threat_defense:6.4.0
Cisco » Firepower Threat Defense » Version: 6.4.0.1

cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.1
Cisco » Firepower Threat Defense » Version: 6.4.0.10

cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.10
Cisco » Firepower Threat Defense » Version: 6.4.0.11

cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.11
Cisco » Firepower Threat Defense » Version: 6.4.0.12

cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.12
Cisco » Firepower Threat Defense » Version: 6.4.0.2

cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.2
Cisco » Firepower Threat Defense » Version: 6.4.0.3

cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.3
Cisco » Firepower Threat Defense » Version: 6.4.0.4

cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.4
Cisco » Firepower Threat Defense » Version: 6.4.0.5

cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.5
Cisco » Firepower Threat Defense » Version: 6.4.0.6

cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.6
Cisco » Firepower Threat Defense » Version: 6.4.0.7

cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.7
Cisco » Firepower Threat Defense » Version: 6.4.0.8

cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.8
Cisco » Firepower Threat Defense » Version: 6.4.0.9

cpe:2.3:a:cisco:firepower_threat_defense:6.4.0.9
Cisco » Firepower Threat Defense » Version: 6.6.0

cpe:2.3:a:cisco:firepower_threat_defense:6.6.0
Cisco » Firepower Threat Defense » Version: 6.6.0.1

cpe:2.3:a:cisco:firepower_threat_defense:6.6.0.1
Cisco » Firepower Threat Defense » Version: 6.6.1

cpe:2.3:a:cisco:firepower_threat_defense:6.6.1
Cisco » Firepower Threat Defense » Version: 6.6.3

cpe:2.3:a:cisco:firepower_threat_defense:6.6.3
Cisco » Firepower Threat Defense » Version: 6.6.4

cpe:2.3:a:cisco:firepower_threat_defense:6.6.4
Cisco » Firepower Threat Defense » Version: 6.6.5

cpe:2.3:a:cisco:firepower_threat_defense:6.6.5
Cisco » Firepower Threat Defense » Version: 6.7.0

cpe:2.3:a:cisco:firepower_threat_defense:6.7.0
Cisco » Firepower Threat Defense » Version: 6.7.0.1

cpe:2.3:a:cisco:firepower_threat_defense:6.7.0.1
Cisco » Firepower Threat Defense » Version: 6.7.0.2

cpe:2.3:a:cisco:firepower_threat_defense:6.7.0.2
Cisco » Firepower Threat Defense » Version: 7.0.0

cpe:2.3:a:cisco:firepower_threat_defense:7.0.0
Cisco » Firepower Threat Defense » Version: 7.0.0.1

cpe:2.3:a:cisco:firepower_threat_defense:7.0.0.1
Cisco » Secure Firewall Management Center » Version: 3.1.0.1

cpe:2.3:a:cisco:secure_firewall_management_center:3.1.0.1
Snort » Snort » Version: 3.0.0.0

cpe:2.3:a:snort:snort:3.0.0.0

Vulnerabilities

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Vulnerability Details CVE-2021-40116

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