In Stormshield Network Security (SNS) before 3.7.25, 3.8.x through 3.11.x before 3.11.13, 4.x before 4.2.10, and 4.3.x before 4.3.5, a flood of connections to the SSLVPN service might lead to saturation of the loopback interface. This could result in the blocking of almost all network traffic, making the firewall unreachable. An attacker could exploit this via forged and properly timed traffic to cause a denial of service.

Flooding SNS firewall versions 3.7.0 to 3.7.29, 3.11.0 to 3.11.17, 4.2.0 to 4.2.10, and 4.3.0 to 4.3.6 with specific forged traffic, can lead to SNS DoS.

An issue was discovered in Stormshield Network Security (SNS) 3.7.0 through 3.7.39, 3.11.0 through 3.11.27, 4.3.0 through 4.3.22, 4.6.0 through 4.6.9, and 4.7.0 through 4.7.1. It's possible to know if a specific user account exists on the SNS firewall by using remote access commands.