CVE-2020-9277: D-Link DSL-2640b Firmware

Critical severity, CVSS 9.8. EPSS: 2.5% chance of exploitation in the next 30 days.

An issue was discovered on D-Link DSL-2640B B2 EU_4.01B devices. Authentication can be bypassed when accessing cgi modules. This allows one to perform administrative tasks (e.g., modify the admin password) with no authentication.

Affected products

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

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