Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Dlink | Dir-605L Firmware | All versions |
| Dlink | Dir-605L | a1 |
Related Weaknesses (CWE)
References
- https://www.securin.io/zero-day/cve-2026-42372-hardcoded-telnet-backdoor-in-d-liExploitThird Party Advisory
- https://www.securin.io/zero-day/cve-2026-42372-hardcoded-telnet-backdoor-in-d-liExploitThird Party Advisory
FAQ
What is CVE-2026-42372?
CVE-2026-42372 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 st...
How severe is CVE-2026-42372?
CVE-2026-42372 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42372?
Check the references section above for vendor advisories and patch information. Affected products include: Dlink Dir-605L Firmware, Dlink Dir-605L.