# CVE-2021-35394: Realtek Jungle SDK Remote Code Execution Vulnerability

> CVE-2021-35394: Realtek Jungle SDK Remote Code Execution Vulnerability. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-35394
Last updated: 2025-10-21T23:25:37Z

- Published: 2021-08-16 11:07 UTC · Updated: 2025-10-21 23:25 UTC · Assigner: mitre
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 99.9%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-12-10, federal due date 2021-12-24, ransomware use: Unknown

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Realtek: Jungle Software Development Kit (SDK)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-35394)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-35394)
- [https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain](https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain)
- [https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en](https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en)
- [https://www.realtek.com/images/safe-report/Realtek\_APRouter\_SDK\_Advisory-CVE-2021-35392\_35395.pdf](https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf)
- [https://www.securityfocus.com/archive/1/534765](https://www.securityfocus.com/archive/1/534765)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-35394 · Markdown: https://rewindex.com/cve/CVE-2021-35394.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-35394 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:11:14.300Z