HOMEVULNERABILITIESCVE-2021-35392
HIGH

CVE-2021-35392

CWE-787Published: August 16, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official 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 heap buffer overflow that is present due to unsafe crafting of SSDP NOTIFY messages from received M-SEARCH messages ST header.

NVD Source

Technical Analysis

CVE-2021-35392 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

realtek1 product(s)
rtl819x jungle software development kit
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://www.realtek.com/en/cu-1-en/cu-1-taiwan-en
PATCHhttps://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf
PATCHhttps://www.realtek.com/en/cu-1-en/cu-1-taiwan-en
PATCHhttps://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf
ADVISORYhttps://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain
ADVISORYhttps://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain

All References (6)

→
https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chainBroken Link · Exploit · Third Party Advisory
→
https://www.realtek.com/en/cu-1-en/cu-1-taiwan-enBroken Link · Patch · Vendor Advisory
→
https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdfPatch · Vendor Advisory
→
https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chainBroken Link · Exploit · Third Party Advisory
→
https://www.realtek.com/en/cu-1-en/cu-1-taiwan-enBroken Link · Patch · Vendor Advisory
→
https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdfPatch · Vendor Advisory

Quick Facts

CVE IDCVE-2021-35392
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-787
CISA KEVNo
Affected1 vendor(s)
PublishedAug 16, 2021

Related CVEs (CWE-787)

CVE-2011-1807
10.0
CVE-2020-11897
10.0
CVE-2004-0574
10.0
CVE-2018-10718
10.0
CVE-2014-1478
10.0
CVE-2012-3957
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-35392 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2021-35392·NVD