CVE-2021-35394
Realtek Jungle SDK Remote Code Execution Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 24 December 2021). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 99.88% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 10 December 2021 · due 24 December 2021
- Weakness
- CWE-78
- Affected
- realtek/rtl819x jungle software development kit
- Source
- cve@mitre.org
EPSS 99.9% since 30 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-35394
References
- https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chainBroken Link, Exploit, Third Party Advisory
- https://www.realtek.com/en/cu-1-en/cu-1-taiwan-enBroken Link, Patch, Vendor Advisory
- https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdfPatch, Vendor Advisory
- https://www.securityfocus.com/archive/1/534765Broken Link, Third Party Advisory, VDB Entry
- https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chainBroken Link, Exploit, Third Party Advisory
- https://www.realtek.com/en/cu-1-en/cu-1-taiwan-enBroken Link, Patch, Vendor Advisory
- https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdfPatch, Vendor Advisory
- https://www.securityfocus.com/archive/1/534765Broken Link, Third Party Advisory, VDB Entry
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35394US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.