CVE-2021-35393
Realtek Jungle SDK UPnP Stack Buffer Overflow RCE Vulnerability
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.
INFO
Published Date :
Aug. 16, 2021, 12:15 p.m.
Last Modified :
Aug. 13, 2025, 3:22 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2021-35393
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | HIGH | [email protected] | ||||
| CVSS 3.1 | CRITICAL | [email protected] |
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-35393.
| URL | Resource |
|---|---|
| https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain | Exploit Third Party Advisory Broken Link |
| https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en | Patch Vendor Advisory Broken Link |
| https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf | Patch Vendor Advisory |
| https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain | Exploit Third Party Advisory Broken Link |
| https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en | Patch Vendor Advisory Broken Link |
| https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf | Patch Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-35393 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-35393
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-35393 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-35393 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Modified Analysis by [email protected]
Aug. 13, 2025
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:realtek:realtek_jungle_sdk:*:*:*:*:*:*:*:* versions from (including) 2.0 up to (including) 3.4.14b OR *cpe:2.3:a:realtek:rtl819x_jungle_software_development_kit:*:*:*:*:*:*:*:* versions from (including) 2.0 up to (including) 3.4.14b Changed Reference Type CVE: https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain Types: Exploit, Third Party Advisory CVE: https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain Types: Broken Link, Exploit, Third Party Advisory Changed Reference Type MITRE: https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain Types: Exploit, Third Party Advisory MITRE: https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain Types: Broken Link, Exploit, Third Party Advisory Changed Reference Type CVE: https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en Types: Patch, Vendor Advisory CVE: https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en Types: Broken Link, Patch, Vendor Advisory Changed Reference Type MITRE: https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en Types: Patch, Vendor Advisory MITRE: https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en Types: Broken Link, Patch, Vendor Advisory -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain Added Reference https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en Added Reference https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Aug. 26, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:C/I:C/A:C) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain No Types Assigned https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain Exploit, Third Party Advisory Changed Reference Type https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en No Types Assigned https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en Patch, Vendor Advisory Changed Reference Type https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf No Types Assigned https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf Patch, Vendor Advisory Added CWE NIST CWE-787 Added CPE Configuration OR *cpe:2.3:a:realtek:realtek_jungle_sdk:*:*:*:*:*:*:*:* versions from (including) 2.0 up to (including) 3.4.14b
Vulnerability Scoring Details
Base CVSS Score: 9.8
Base CVSS Score: 10
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
11.74 }} 2.74%
score
0.93309
percentile