An Improper Authentication issue was discovered in Ctek SkyRouter Series 4200 and 4400, all versions prior to V6.00.11. By accessing a specific uniform resource locator (URL) on the web server, a malicious user is able to access the application without authenticating.
Severity
CVSS 3.0
9.4 critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
EPSS
2.3% chance of exploitation in the next 30 days; higher than 83% of CVEs (scores of 2026-10-31)