CVE-2020-9279: D-Link DSL-2640b Firmware

Critical severity, CVSS 9.8. EPSS: 2.2% chance of exploitation in the next 30 days.

An issue was discovered on D-Link DSL-2640B B2 EU_4.01B devices. A hard-coded account allows management-interface login with high privileges. The logged-in user can perform critical tasks and take full control of the device.

Affected products

• D-Link DSL-2640b Firmware: version eu_4.01b only

Published 2020-04-20. Last modified 2026-06-17.