CVE-2021-35394Realtek Jungle SDK version v2.x up to v3.4.14B provides a diagnostic tool called 'MP Daemon' that is usually compiled as 'UDPServer' binary.
Updated under an hour ago ()
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It affects realtek rtl819x_jungle_software_development_kit. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Dec 10, 2021; federal agencies had to remediate by Dec 24, 2021. Treat that date as your deadline.
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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
- 9.8 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-78
- Known exploited
- Added to CISA KEV Dec 10, 2021; federal remediation due Dec 24, 2021Apply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 99.88% (percentile 100)
- Assigned by
- mitre
- NVD analysis
- Analyzed
- Record last updated
- Oct 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
realtek rtl819x_jungle_software_development_kit realtek:rtl819x_jungle_software_development_kit | from 2.0 through 3.4.14b | NVD |
References
- https://www.securityfocus.com/archive/1/534765x-refsource-misc, broken-link, third-party-advisory, vdb-entry
- https://www.realtek.com/en/cu-1-en/cu-1-taiwan-enx-refsource-misc, broken-link, patch, vendor-advisory
- https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdfx-refsource-misc, patch, vendor-advisory
- https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chainx-refsource-misc, broken-link, exploit, third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35394us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.