Is CVE-2021-35394 in the CISA KEV catalog?

Yes. CVE-2021-35394 is on the CISA Known Exploited Vulnerabilities list, added 2021-12-10.

What is the CVSS severity of CVE-2021-35394?

CVE-2021-35394 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2021-35394?

CVE-2021-35394 has an EPSS score of 99.86% (100th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2021-35394

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

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.

CWE-78OS Command Injection

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

99.86%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Realtek Jungle SDK Remote Code Execution Vulnerability

RealTek Jungle SDK contains multiple memory corruption vulnerabilities which can allow an attacker to perform remote code execution.

Apply updates per vendor instructions.

Remediation due: 2021-12-24

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-07.