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Vulnerabilities

Vulnerability · CVE-2021-35394

Realtek Jungle SDK Remote Code Execution Vulnerability

Published Aug 16, 2021 · catalog updated Jun 16, 2026 · Realtek Jungle Software Development Kit (SDK)

Patch now

CVE-2021-35394 is in the CISA known-exploited catalog, due Dec 24, 2021. Confirm Realtek Jungle Software Development Kit (SDK) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
99.88%
Remediation
Remediation guidance
Affected products
cpe realtek/rtl819x jungle software development kit · vendor Realtek Jungle Software Development Kit (SDK)

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe realtek/rtl819x jungle software development kitversion unspecified
  • vendor Realtek Jungle Software Development Kit (SDK)version unspecified

How to fix CVE-2021-35394

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-35394 is in the CISA known-exploited catalog, due Dec 24, 2021. Confirm Realtek Jungle Software Development Kit (SDK) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply updates per vendor instructions.

What should an analyst verify?

CWE-138; CWE-78: OS Command Injection. EPSS 99.88%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 16, 2021 · Catalog

    Detected

    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.

  2. Dec 10, 2021 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Dec 24, 2021 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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.

Sources

  • CISA KEVConfirmed exploitationCVE-2021-35394

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

    cisa.gov
  • CVE.orgVulnerability recordCVE-2021-35394

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-35394

    30-day exploitation probability 99.9%

    first.org
  • NIST NVDVulnerability recordCVE-2021-35394

    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

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2021-35394

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

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.