What is CVE-2026-42375?

CVE-2026-42375 is a critical-severity vulnerability in D-link Dir-600l Firmware, classified under Use of Hard-coded Credentials. CVSS score: 9.8/10. Published 2026-05-04.

How severe is CVE-2026-42375?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in D-link Dir-600l Firmware

CVE-2026-42375

D-Link DIR-600L Hardware Revision A1 (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 "wrgn35_dlwbr_dir600l" read fr…

EPSS: 0.002 (39.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

D-link Dir-600l Firmware — versions A1
Dlink Dir-600l — versions a1
Dlink Dir-600l_firmware

Weakness classification (CWE)

CWE-798 — Use of Hard-coded Credentials

References

D-Link DIR-600L A1 Hardcoded Telnet Backdoor - Securin Advisory (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2026-42375?: CVE-2026-42375 is a critical-severity vulnerability in D-link Dir-600l Firmware, classified under Use of Hard-coded Credentials. CVSS score: 9.8/10. Published 2026-05-04.
How severe is CVE-2026-42375?: Critical severity. CVSS v3 base score is 9.8 out of 10.