EUVD-2026-27027CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionNVD
D-Link DIR-600L Hardware Revision A1 (End-of-Life) 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_dir600l" 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
Remote root shell access via hardcoded telnet backdoor in D-Link DIR-600L Hardware Revision A1 allows network-adjacent attackers to authenticate with publicly known credentials ('Alphanetworks' / 'wrgn35_dlwbr_dir600l') and obtain full administrative control. The backdoor telnet daemon launches automatically at boot with static credentials stored in /etc/alpha_config/image_sign. …
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RemediationAI
Within 24 hours: Inventory all D-Link DIR-600L Hardware Revision A1 devices across the network and document their location, connected systems, and criticality. Within 7 days: Isolate or physically disconnect any DIR-600L devices not essential to operations; if isolation is infeasible, segment them to a restricted VLAN with no access to sensitive systems or data. …
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