CVE-2021-35392

HIGHNVD 7.58.9▲
EchelonGraph scoreHIGH confidence

Score elevated to 8.9 because EPSS predicts 83% probability of exploitation within the next 30 days (top 0.4% of all CVEs). NVD baseline CVSS 7.5 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Elevated
8.9EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 83%
CISA-KEV: Not listedEPSS PROB: 83%CVSS: 7.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Realtek Jungle SDK version v2.x up to v3.4.14B provides a 'WiFi Simple Config' server that implements both UPnP and SSDP protocols. The binary is usually named wscd or mini_upnpd and is the successor to miniigd. The server is vulnerable to a heap buffer overflow that is present due to unsafe crafting of SSDP NOTIFY messages from received M-SEARCH messages ST header.

CVSS v3
7.5
EG Score
8.9(high)
EG Risk
78(Track)
EG Risk 78/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity89% × 45%
Exploitation83% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
83%
EPSS %ILE
100%
KEV
Not listed

Published

August 16, 2021

Last Modified

August 13, 2025

References (6)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 21× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-24 14:00 UTCEPSS rescore
  2. 2026-09-22 14:44 UTCEPSS rescore
  3. 2026-09-21 20:28 UTCEPSS rescore
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  10. 2026-09-15 03:06 UTCEPSS rescore
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  1. 2026-08-19 17:01 UTCEPSS rescore
  2. 2026-08-18 13:45 UTCEPSS rescore
  3. 2026-08-17 13:44 UTCEPSS rescore
  4. 2026-08-16 02:11 UTCEPSS rescore
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  6. 2026-08-13 21:57 UTCEPSS rescore
  7. 2026-08-06 13:43 UTCEPSS rescore
  8. 2026-08-03 10:33 UTCEPSS rescore
  9. 2026-08-02 02:24 UTCEPSS rescore
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  11. 2026-07-30 16:25 UTCEPSS rescore
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  16. 2026-07-23 14:16 UTCEPSS rescore
  17. 2026-07-23 14:16 UTCEPSS rescore
  18. 2026-07-23 02:02 UTCEG score recompute▲ 1.40
  19. 2026-07-22 22:49 UTCEG score recompute
  20. 2026-07-22 14:06 UTCEPSS rescore
  21. 2026-07-22 14:06 UTCEPSS rescore
  22. 2026-07-20 17:05 UTCEPSS rescore
  23. 2026-07-19 02:27 UTCEPSS rescore
  24. 2026-07-15 16:55 UTCEPSS rescore
  25. 2026-07-13 06:10 UTCEPSS rescore
  26. 2026-07-11 08:25 UTCEPSS rescore
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  28. 2026-07-08 15:12 UTCEPSS rescore
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  35. 2026-06-25 13:48 UTCEPSS rescore
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  37. 2026-06-23 21:31 UTCEPSS rescore
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  39. 2026-06-21 01:58 UTCEPSS rescore
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  41. 2026-06-15 17:46 UTCEPSS rescore
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  44. 2026-06-12 23:10 UTCEPSS rescore
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  47. 2026-06-10 22:16 UTCEPSS rescore
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  49. 2026-06-08 14:15 UTCEPSS rescore
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  53. 2026-06-05 22:45 UTCEPSS rescore
  54. 2026-06-05 06:09 UTCEPSS rescore
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  56. 2026-06-04 13:10 UTCEPSS rescore
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  62. 2026-05-31 00:15 UTCEPSS rescore
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  64. 2026-05-29 13:42 UTCEPSS rescore
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  66. 2026-05-28 13:43 UTCEPSS rescore
  67. 2026-05-28 13:43 UTCEPSS rescore
  68. 2026-05-27 13:39 UTCEPSS rescore
  69. 2026-05-27 13:39 UTCEPSS rescore
  70. 2026-05-27 13:39 UTCEPSS rescore
  71. 2026-05-26 11:59 UTCEG score recompute
  72. 2026-05-26 11:59 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2021-35392?
CVE-2021-35392 is a high vulnerability published on August 16, 2021. Realtek Jungle SDK version v2.x up to v3.4.14B provides a 'WiFi Simple Config' server that implements both UPnP and SSDP protocols. The binary is usually named wscd or mini_upnpd and is the successor to miniigd. The server is vulnerable to a heap buffer overflow that is present due to unsafe…
When was CVE-2021-35392 disclosed?
CVE-2021-35392 was first published in the National Vulnerability Database on August 16, 2021, with the most recent update on August 13, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-35392 actively exploited?
CVE-2021-35392 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 83% probability of exploitation in the next 30 days, which ranks it in the top 0.3% of all scored CVEs.
What is the CVSS score of CVE-2021-35392?
CVE-2021-35392 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.9.
How do I remediate CVE-2021-35392?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-35392, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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