D-Link Dir 456u Firmware
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By the Year
In 2026 there have been 1 vulnerability in D-Link Dir 456u Firmware with an average score of 9.8 out of ten.
| Year | Vulnerabilities | Average Score |
|---|---|---|
| 2026 | 1 | 9.80 |
It may take a day or so for new Dir 456u Firmware vulnerabilities to show up in the stats or in the list of recent security vulnerabilities. Additionally vulnerabilities may be tagged under a different product or component name.
Recent D-Link Dir 456u Firmware Security Vulnerabilities
Hardcoded Telnet Backdoor in D-Link DIR-456U (EOL)
CVE-2026-42376
9.8 - Critical
- May 04, 2026
D-Link DIR-456U Hardware Revision A1 (End-of-Life, EOL) contains a hardcoded telnet backdoor. The device starts a telnet daemon at boot via /etc/init0.d/S80telnetd.sh with the username "Alphanetworks" and the static password "whdrv01_dlob_dir456U" read from /etc/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.
Use of Hard-coded Credentials
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