CVE-2021-35394

Realtek Jungle SDK Remote Code Execution

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 99.9%

Published16 Aug 2021
Added to CISA KEV10 Dec 2021
Remediation due24 Dec 2021

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.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Realtek Rtl819x Jungle Software Development Kit≥ 2.0 ≤ 3.4.14b

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

Patch & vendor advisories

References

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35394US Government Resource
https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chainBroken LinkExploitThird Party Advisory
https://www.realtek.com/en/cu-1-en/cu-1-taiwan-enBroken LinkPatchVendor Advisory
https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdfPatchVendor Advisory
https://www.securityfocus.com/archive/1/534765Broken LinkThird Party AdvisoryVDB Entry

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2021-35394 being actively exploited?

Yes. CVE-2021-35394 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 10 Dec 2021.

How severe is CVE-2021-35394?

CVE-2021-35394 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 99.9% probability of exploitation.

Which products are affected by CVE-2021-35394?

Affected products include Realtek Rtl819x Jungle Software Development Kit.

How do I fix CVE-2021-35394?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-35394 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.