What’s Vulnerable › Vulnerabilities

CVE-2021-35393

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 68.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-16 · updated 2026-06-17
• Weakness: CWE-787

Description

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 through 3.4.14b

References

• https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain
• 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_35395.pdf
• https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain
• 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_35395.pdf

Get alerted when CVE-2021-35393 or the next vulnerability affects your stack