An issue was discovered on D-Link DWR-116 through 1.06 DIR-140L through 1.02 DIR-640L through 1.02 DWR-512 through 2.02 DWR-712 through 2.02 DWR-912 through 2.02 DWR-921 through 2.02 and DWR-111 through 1.01 devices. The administrative password is stored in plaintext in the /tmp/csman/0 file. An attacker having a directory traversal (or LFI) can easily get full router access.