CVE-2020-21733: Sagemcom F@st 3686 Firmware

Medium severity, CVSS 6.1. EPSS: 0.7% chance of exploitation in the next 30 days.

Sagemcom F@ST3686 v1.0 HUN 3.97.0 has XSS via RgDiagnostics.asp, RgDdns.asp, RgFirewallEL.asp, RgVpnL2tpPptp.asp.

Affected products

• Sagemcom F@st 3686 Firmware: version 1.0_hun_3.97.0 only

Published 2020-09-14. Last modified 2026-07-09.