CVE-2021-35393: Realtek RTL819X Jungle Software Development Kit

Critical severity, CVSS 9.8. EPSS: 70.3% chance of exploitation in the next 30 days.

Realtek Jungle SDK version v2.x up to v3.4.14B provides a 'WiFi Simple Config' server that implements both UPnP and SSDP protocols. The binary is usually named wscd or mini_upnpd and is the successor to miniigd. The server is vulnerable to a stack buffer overflow vulnerability that is present due to unsafe parsing of the UPnP SUBSCRIBE/UNSUBSCRIBE Callback header. Successful exploitation of this vulnerability allows remote unauthenticated attackers to gain arbitrary code execution on the affected device.

Affected products

• Realtek RTL819X Jungle Software Development Kit: from 2.0, up to and including 3.4.14b

Published 2021-08-16. Last modified 2026-06-17.