CVE-2021-40116: Multiple Cisco Products Snort Rule Denial of Service Vulnerability
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.
Affected Software
Event History
Frequently Asked Questions
What is CVE-2021-40116?
CVE-2021-40116 is a vulnerability in Snort rules that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
Which Cisco products are affected by CVE-2021-40116?
Cisco Firepower Management Center version 3.1.0.1, Cisco Firepower Threat Defense versions 6.4.0 to 6.4.0.13, 6.6.0 to 6.6.5.1, 6.7.0 to 6.7.0.3, and 7.0.0 to 7.0.1 are affected by CVE-2021-40116.
What is the severity of CVE-2021-40116?
CVE-2021-40116 has a severity score of 7.5 (high).
How can an attacker exploit CVE-2021-40116?
An attacker can exploit CVE-2021-40116 by sending specially crafted network traffic to the affected device.
Where can I find more information about CVE-2021-40116?
More information about CVE-2021-40116 can be found at the following link: [Cisco Security Advisory](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-dos-RywH7ezM)