Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-35394

CVE-2021-35394CRITICAL

n/a n/a — Realtek Jungle Software Development Kit (SDK)

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS    %ile   KEV
   N   L   N   N  U  H  H  H    9.8   .9986   100.0   YES

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Jun 23  Reserved by mitre
  Aug 16  Published (CNA: mitre)
  Dec 10  Added to CISA KEV, remediation due 2021-12-24

CWE-78 · CNA: mitre · CVSS v3.1 · 5 references · KEV due December 24, 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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 23, 2021	Reserved	Reserved by mitre
August 16, 2021	Published	Published (CNA: mitre)
December 10, 2021	KEV ADDED	Added to CISA KEV, remediation due 2021-12-24

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-78

References (5)

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35394 [government-resource]
https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain [x_refsource_MISC]
https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en [x_refsource_MISC]
https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf [x_refsource_MISC]
https://www.securityfocus.com/archive/1/534765 [x_refsource_MISC]

Authoritative record: CVE-2021-35394 at cve.org

Weaknesses: CWE-78

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-35394 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.