Vulnerabilities > CVE-2021-40116

CVSS 7.5 - HIGH

Attack vector

NETWORK

Attack complexity

LOW

Privileges required

NONE

Confidentiality impact

NONE

Integrity impact

NONE

Availability impact

HIGH

network

low complexity

cisco

snort

NVD

Published: 2021-10-27

Updated: 2023-11-07

Summary

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.

Vulnerable Configurations

Part	Description	Count
Application	Cisco Cisco Firepower Threat Defense 7.0.0 Cisco Firepower Threat Defense 7.0.0.1 Cisco Firepower Threat Defense 6.7.0 Cisco Firepower Threat Defense 6.7.0.1 Cisco Firepower Threat Defense 6.7.0.2 Cisco Firepower Threat Defense 6.7.0.3 Cisco Firepower Threat Defense 6.6.0 Cisco Firepower Threat Defense 6.6.0.1 Cisco Firepower Threat Defense 6.6.1 Cisco Firepower Threat Defense 6.6.3 Cisco Firepower Threat Defense 6.6.4 Cisco Firepower Threat Defense 6.6.5 Cisco Firepower Threat Defense 6.4.0 Cisco Firepower Threat Defense 6.4.0.1 Cisco Firepower Threat Defense 6.4.0.2 Cisco Firepower Threat Defense 6.4.0.3 Cisco Firepower Threat Defense 6.4.0.4 Cisco Firepower Threat Defense 6.4.0.5 Cisco Firepower Threat Defense 6.4.0.6 Cisco Firepower Threat Defense 6.4.0.7 Cisco Firepower Threat Defense 6.4.0.8 Cisco Firepower Threat Defense 6.4.0.9 Cisco Firepower Threat Defense 6.4.0.10 Cisco Firepower Threat Defense 6.4.0.11 Cisco Firepower Threat Defense 6.4.0.12 Cisco Firepower Management Center 3.1.0.1	26
Application	Snort Snort Snort 3.0.0.0	1

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-dos-RywH7ezM

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Summary

Vulnerable Configurations

References

Vulnerabilities > CVE-2021-40116