CVE-2026-42373
published 2026-05-04CVE-2026-42373: D-Link DIR-605L Hardware Revision B2 (End-of-Life, EOL) contains a hardcoded telnet backdoor. The device starts a telnet daemon at boot via /bin/telnetd.sh…
PriorityP357high8.8CVSS 3.1
AVAACLPRNUINSUCHIHAH
EPSS
0.47%
37.7th percentile
D-Link DIR-605L Hardware Revision B2 (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 "wrgn76_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.
Affected
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| d-link | dir-605l_firmware | — | — |
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GHSA
GHSA-5jm4-j7g4-8xfh: D-Link DIR-605L Hardware Revision B2 (End-of-Life, EOL) contains a hardcoded telnet backdoor
ghsa_unreviewed·2026-05-04
CVE-2026-42373 [CRITICAL] CWE-798 GHSA-5jm4-j7g4-8xfh: D-Link DIR-605L Hardware Revision B2 (End-of-Life, EOL) contains a hardcoded telnet backdoor
D-Link DIR-605L Hardware Revision B2 (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 "wrgn76_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.
VulDB
D-Link DIR-605L B2 /bin/telnetd.sh strcmp hard-coded credentials (EUVD-2026-27023)
vuldb·2026-05-04·CVSS 9.8
CVE-2026-42373 [CRITICAL] D-Link DIR-605L B2 /bin/telnetd.sh strcmp hard-coded credentials (EUVD-2026-27023)
A vulnerability marked as critical has been reported in D-Link DIR-605L B2. Affected by this vulnerability is the function strcmp of the file /bin/telnetd.sh. Performing a manipulation results in hard-coded credentials. This vulnerability only affects products that are no longer supported by the maintainer.
This vulnerability is reported as CVE-2026-42373. The attacker must have access to the local network to execute the attack. No exploit exists.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-05-04
Published