CVE-2021-35394
Realtek Jungle SDK Remote Code Execution Vulnerability - [Actively Exploited]
Description
Realtek Jungle SDK version v2.x up to v3.4.14B provides a diagnostic tool called 'MP Daemon' that is usually compiled as 'UDPServer' binary. The binary is affected by multiple memory corruption vulnerabilities and an arbitrary command injection vulnerability that can be exploited by remote unauthenticated attackers.
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]
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
RealTek Jungle SDK contains multiple memory corruption vulnerabilities which can allow an attacker to perform remote code execution.
Apply updates per vendor instructions.
https://nvd.nist.gov/vuln/detail/CVE-2021-35394
Affected Products
The following products are affected by CVE-2021-35394
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] | ||||
| CVSS 3.1 | CRITICAL | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Public PoC/Exploit Available at Github
CVE-2021-35394 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
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-2021-35394.
| 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 | Broken Link Patch Vendor Advisory |
| https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf | Patch Vendor Advisory |
| https://www.securityfocus.com/archive/1/534765 | Broken Link Third Party Advisory VDB Entry |
| 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 | Broken Link Patch Vendor Advisory |
| https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf | Patch Vendor Advisory |
| https://www.securityfocus.com/archive/1/534765 | Broken Link Third Party Advisory VDB Entry |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-35394 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-2021-35394
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).
A comparative cloud honeypot project that utilises google cloud platform and microsoft azure.
Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.
cisa-kev vulnerability 0day cisa exploits
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-35394 vulnerability anywhere in the article.
-
360 Netlab Blog - Network Security Research Lab at 360
Fodcha, a new DDos botnet
OverviewRecently, CNCERT and 360netlab worked together and discovered a rapidly spreading DDoS botnet on the Internet. The global infection looks fairly big as just in China there are more than 10,000 ... Read more
The following table lists the changes that have been made to the
CVE-2021-35394 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.
-
Reanalysis by [email protected]
Aug. 13, 2025
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a: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 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.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 -
Modified Analysis by [email protected]
Apr. 17, 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:jungle_sdk:*:*:*:*:*:*:*:* versions from (including) 2.0 up to (including) 3.4.14b 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 Changed Reference Type MITRE: https://www.securityfocus.com/archive/1/534765 Types: Third Party Advisory, VDB Entry MITRE: https://www.securityfocus.com/archive/1/534765 Types: Broken Link, Third Party Advisory, VDB Entry Changed Reference Type CVE: https://www.securityfocus.com/archive/1/534765 Types: Third Party Advisory, VDB Entry CVE: https://www.securityfocus.com/archive/1/534765 Types: Broken Link, Third Party Advisory, VDB Entry 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 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Feb. 04, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-78 -
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 Added Reference https://www.securityfocus.com/archive/1/534765 -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CWE Remap by [email protected]
Jun. 28, 2022
Action Type Old Value New Value Changed CWE NVD-CWE-noinfo CWE-77 CWE-787 -
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 Changed Reference Type https://www.securityfocus.com/archive/1/534765 No Types Assigned https://www.securityfocus.com/archive/1/534765 Third Party Advisory, VDB Entry Added CWE NIST NVD-CWE-noinfo 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.
94.34 }} 0.29%
score
0.99942
percentile