High · published October 27, 2021
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.
| Product | Versions | Fixed in |
|---|---|---|
| cisco/secure_firewall_management_center | all versions | — |
| cisco/secure_firewall_threat_defense | ≥ 6.4.0, < 6.4.0.13 | 6.4.0.13 |
| cisco/secure_firewall_threat_defense | ≥ 6.6.0, < 6.6.5.1 | 6.6.5.1 |
| cisco/secure_firewall_threat_defense | ≥ 6.7.0, < 6.7.0.3 | 6.7.0.3 |
| cisco/secure_firewall_threat_defense | ≥ 7.0.0, < 7.0.1 | 7.0.1 |
| cisco/snort | ≥ 3.0.0.0, < 3.1.0.100 | 3.1.0.100 |