An issue was discovered in Stormshield Network Security (SNS) 4.0.0 through 4.3.25, 4.4.0 through 4.7.5, and 4.8.0. Certain manipulations allow restarting in single-user mode despite the activation of secure boot. The following versions fix this: 4.3.27, 4.7.6, and 4.8.2.