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.

• cisco secure firewall management center 3.1.0.1 • cisco secure firewall threat defense (>= 6.4.0 < 6.4.0.13) • cisco secure firewall threat defense (>= 6.6.0 < 6.6.5.1) • cisco secure firewall threat defense (>= 6.7.0 < 6.7.0.3) • cisco secure firewall threat defense (>= 7.0.0 < 7.0.1) • cisco snort (>= 3.0.0.0 < 3.1.0.100)