EUVD-2026-27021CVSS VectorNVD
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionNVD
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.
AnalysisAI
Hardcoded credentials in D-Link DIR-605L Hardware Revision A1 firmware grant root-level telnet access to unauthenticated attackers on adjacent networks. The telnet daemon automatically starts at boot with username 'Alphanetworks' and static password 'wrgn35_dlwbr_dir605l', enabling complete device takeover including network traffic interception, configuration modification, and pivot attacks against internal networks. …
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RemediationAI
Within 24 hours: Conduct network scan to identify all D-Link DIR-605L Hardware Revision A1 devices in production and document their current business function. Within 7 days: Isolate affected devices from production networks or place behind monitored network segments; disable telnet access at the network perimeter if device removal is not immediately feasible. …
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