Vulnerability Details CVE-2026-42372
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 25.9%
CVSS Severity
CVSS v3 Score 8.8
References
Products affected by CVE-2026-42372
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cpe:2.3:h:dlink:dir-605l:a1
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cpe:2.3:o:dlink:dir-605l_firmware:1.00
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cpe:2.3:o:dlink:dir-605l_firmware:1.12
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cpe:2.3:o:dlink:dir-605l_firmware:1.13
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cpe:2.3:o:dlink:dir-605l_firmware:1.14b06
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cpe:2.3:o:dlink:dir-605l_firmware:1.17b01
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cpe:2.3:o:dlink:dir-605l_firmware:2.00
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cpe:2.3:o:dlink:dir-605l_firmware:2.01mt
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cpe:2.3:o:dlink:dir-605l_firmware:2.04
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cpe:2.3:o:dlink:dir-605l_firmware:2.06b01
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cpe:2.3:o:dlink:dir-605l_firmware:2.07b02
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cpe:2.3:o:dlink:dir-605l_firmware:2.08b01
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cpe:2.3:o:dlink:dir-605l_firmware:2.12b1
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cpe:2.3:o:dlink:dir-605l_firmware:2.13b01
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cpe:2.3:o:dlink:dir-605l_firmware:3.02
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cpe:2.3:o:dlink:dir-605l_firmware:3.03b07
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cpe:2.3:o:dlink:dir-605l_firmware:6.02cn02