CVE-2021-35393

Public Exploit

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.

Category

9.8
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 2.0 •
EPSS 9.00% Top 10%
Vendor Advisory realtek.com Vendor Advisory realtek.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en vendor advisory broken link patch
https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf vendor advisory patch
https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain broken link third party advisory exploit

Frequently Asked Questions

What is the severity of CVE-2021-35393?
CVE-2021-35393 has been scored as a critical severity vulnerability.
How to fix CVE-2021-35393?
To fix CVE-2021-35393, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-35393 being actively exploited in the wild?
It is possible that CVE-2021-35393 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~9% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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