CVE-2020-9276: D-Link DSL-2640b Firmware

High severity, CVSS 8.8. EPSS: 2.6% chance of exploitation in the next 30 days.

An issue was discovered on D-Link DSL-2640B B2 EU_4.01B devices. The function do_cgi(), which processes cgi requests supplied to the device's web servers, is vulnerable to a remotely exploitable stack-based buffer overflow. Unauthenticated exploitation is possible by combining this vulnerability with CVE-2020-9277.

Affected products

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

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