CVE-2019-18852: D-Link DIR-600 b1 Firmware

Critical severity, CVSS 9.8. EPSS: 1.6% chance of exploitation in the next 30 days.

Certain D-Link devices have a hardcoded Alphanetworks user account with TELNET access because of /etc/config/image_sign or /etc/alpha_config/image_sign. This affects DIR-600 B1 V2.01 for WW, DIR-890L A1 v1.03, DIR-615 J1 v100 (for DCN), DIR-645 A1 v1.03, DIR-815 A1 v1.01, DIR-823 A1 v1.01, and DIR-842 C1 v3.00.

Affected products

• D-Link DIR-600 b1 Firmware: version 2.01 only
• D-Link Dir-615 j1 Firmware: version 100 only
• D-Link DIR-645 a1 Firmware: version 1.03 only
• D-Link Dir-815 a1 Firmware: version 1.01 only
• D-Link Dir-823 a1 Firmware: version 1.01 only
• D-Link Dir-842 c1 Firmware: version 3.00 only
• D-Link Dir-890l a1 Firmware: version 1.03 only

Published 2019-11-11. Last modified 2026-06-17.