VULNERABILITY

Cisco FTD: CVE-2021-40116: Multiple Cisco Products Snort Rule Denial of Service Vulnerability

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Cisco FTD: CVE-2021-40116: Multiple Cisco Products Snort Rule Denial of Service Vulnerability

Severity
8
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:C)
Published
10/27/2021
Created
02/07/2025
Added
01/29/2025
Modified
02/12/2025

Description

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.

Solution(s)

  • cisco-ftd-upgrade-latest

References

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