CVE-2021-35393

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.

CVSS v3.1 NVD

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 NVD

10.0 HIGHAV:N/AC:L/Au:N/C:C/I:C/A:C

EPSS

68.30% chance of exploitation in the next 30 days, 99th percentile

Published

2021-08-16

Updated

2024-08-04

Proof-of-concept exploits (1)

• https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain

Security advisories

• https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en
• https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_3…

References

• CVE Record
• NVD entry