For WRC-X1500GS-B and WRC-X1500GSA-B, the initial passwords can be calculated easily from the system information.
Exploitability
AV:PAC:LAT:NPR:NUI:NVulnerable System
VC:HVI:NVA:NSubsequent System
SC:NSI:NSA:N5.1/CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:NOther