CVE-2021-35394
Realtek Jungle SDK Remote Code Execution Vulnerability
IN CISA KEV
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.
- Vendor
- Realtek
- Product
- Jungle Software Development Kit (SDK)
- CVSS 3.1
- 9.8 (critical), scored by NVD (primary)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVSS 3.1
- 9.8 (critical), scored by 134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-78
- Published
- 2021-08-16
- NVD modified
- 2026-06-17
- NVD status
- Analyzed
CISA KEV
- Date added
- 2021-12-10
- Due date
- 2021-12-24
- Ransomware use
- Unknown
- Required action
- Apply updates per vendor instructions.
EPSS
100% chance of exploitation in the next 30 days (percentile 99th)
FIRST EPSS, updated 17 Oct 2026. About EPSS
CVSS is severity, EPSS is likelihood, KEV means already exploited. EPSS is a statistical probability, not a certainty: a low score does not make a bug safe, and a high one does not prove it is being exploited.
References
- www.realtek.com (Broken Link, Patch, Vendor Advisory)
- www.realtek.com (Patch, Vendor Advisory)
- www.securityfocus.com (Broken Link, Third Party Advisory, VDB Entry)
- www.realtek.com (Broken Link, Patch, Vendor Advisory)
- www.realtek.com (Patch, Vendor Advisory)
- www.securityfocus.com (Broken Link, Third Party Advisory, VDB Entry)
- www.cisa.gov (US Government Resource)
Data last updated 18 Oct 2026. Sources: NVD API 2.0, CISA KEV catalog, FIRST EPSS. Links: NVD, CISA KEV. Metadata only. ThreatWire does not host exploit code.