🛡️ CVE-2026-42374
🔴 CVSS 9.8 — Critical ⚠️ Exploit Public CWE-798 NVD
9.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

D-Link DIR-600L Hardware Revision B1 (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 "wrgn61_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.

Details

Severity CRITICAL
CVSS Score 9.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-798
Public Exploit ⚠️ Yes
Source NVD
Published 2026-05-04
Updated 2026-06-02
Modified 2026-05-06
Fix URL N/A

Affected Packages

Software From version Fixed in
dir-600l-firmware — —

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