CVE-2026-42372
D-Link DIR-605L A1 Hardcoded Telnet Backdoor Credentials
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
D-Link DIR-605L Hardware Revision A1 (End-of-Life, EOL) contains a hardcoded telnet backdoor. The device starts a telnet daemon at boot via /bin/telnetd.sh with the username "Alphanetworks" and the static password "wrgn35_dlwbr_dir605l" read from /etc/alpha_config/image_sign. The custom telnetd binary accepts a -u user:password flag, and the custom login binary uses strcmp() to validate credentials. Successful authentication grants an unauthenticated attacker on the local network a root shell with full administrative control. The device has reached End-of-Life (EOL) and will not receive patches.
| CWE | CWE-798 |
| Vendor | d-link |
| Product | dir-605l firmware |
| Published | May 4, 2026 |
| Last Updated | May 4, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
D-Link / DIR-605L Firmware
A1
References
Credits
Arjun Basnet From Securin Labs