CVE-2026-30704

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-03-18. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

The WiFi Extender WDR201A (HW V2.1, FW LFMZX28040922V1.02) exposes an unprotected UART interface through accessible hardware pads on the PCB

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

March 18, 2026

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

Oscilloscope Manufacturer, Measurement & Analysis Instruments, Mini Oscilloscope Supplier - Shenzhen Yipu Commercial and Trading Co., Ltd

https://www.made-in-china.com/showroom/yeapook/#:~:text=Established%20in%202015.%2CDistrict%2C%20Shenzhen%2C%20Guangdong%2C%20China
generic

From Blackbox Testing to Firmware Reversal: Multiple CVEs in a Consumer WiFi Extender | Street #CySec - Tales of a cybersecurity journey

https://mstreet97.github.io/security-research/iot/vulnerability-disclosure/cybersecurity/cve/2026/02/18/From-Blackbox-to-Whitebox-Multiple-CVEs-in-a-Consumer-WiFi-Extender.html

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 28× 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. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 19:27 UTCEPSS rescore
  3. 2026-09-17 19:30 UTCEPSS rescore
  4. 2026-09-16 14:08 UTCEPSS rescore
  5. 2026-09-16 05:15 UTCEPSS rescore
  6. 2026-09-13 16:47 UTCEPSS rescore
  7. 2026-09-12 15:01 UTCEPSS rescore
  8. 2026-09-10 09:34 UTCEPSS rescore
  9. 2026-09-08 22:00 UTCEPSS rescore
  10. 2026-09-07 16:01 UTCEPSS rescore
  11. 2026-09-06 13:47 UTCEPSS rescore
  12. 2026-09-06 13:47 UTCEPSS rescore
  13. 2026-09-04 05:06 UTCEPSS rescore
  14. 2026-09-02 14:11 UTCEPSS rescore
  15. 2026-09-01 13:53 UTCEPSS rescore
  16. 2026-09-01 04:39 UTCEPSS rescore
  17. 2026-09-01 04:39 UTCEPSS rescore
  18. 2026-08-30 19:17 UTCEPSS rescore
  19. 2026-08-30 01:22 UTCEPSS rescore
  20. 2026-08-28 21:41 UTCEPSS rescore
  21. 2026-08-27 14:25 UTCEPSS rescore
  22. 2026-08-26 14:46 UTCEPSS rescore
  23. 2026-08-25 13:49 UTCEPSS rescore
  24. 2026-08-24 14:17 UTCEPSS rescore
  25. 2026-08-23 00:19 UTCEPSS rescore
Show 69 more
  1. 2026-08-21 23:49 UTCEPSS rescore
  2. 2026-08-20 22:55 UTCEPSS rescore
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-18 13:48 UTCEPSS rescore
  6. 2026-08-17 13:47 UTCEPSS rescore
  7. 2026-08-16 14:56 UTCEPSS rescore
  8. 2026-08-16 11:15 UTCEG score recompute
  9. 2026-08-16 11:15 UTCGHSA enrichment
  10. 2026-08-16 02:14 UTCEPSS rescore
  11. 2026-08-15 01:30 UTCEPSS rescore
  12. 2026-08-15 00:15 UTCGHSA enrichment
  13. 2026-08-14 20:02 UTCGHSA enrichment
  14. 2026-08-14 15:49 UTCGHSA enrichment
  15. 2026-08-14 11:36 UTCGHSA enrichment
  16. 2026-08-14 07:23 UTCEG score recompute
  17. 2026-08-14 07:23 UTCGHSA enrichment
  18. 2026-08-13 22:00 UTCEPSS rescore
  19. 2026-08-13 02:23 UTCGHSA enrichment
  20. 2026-08-12 22:10 UTCEG score recompute
  21. 2026-08-12 22:10 UTCGHSA enrichment
  22. 2026-08-12 13:50 UTCEPSS rescore
  23. 2026-08-12 01:44 UTCGHSA enrichment
  24. 2026-08-11 21:31 UTCEG score recompute
  25. 2026-08-11 21:30 UTCGHSA enrichment
  26. 2026-08-11 08:48 UTCGHSA enrichment
  27. 2026-08-11 04:35 UTCEG score recompute
  28. 2026-08-11 04:35 UTCGHSA enrichment
  29. 2026-08-11 00:00 UTCEPSS rescore
  30. 2026-08-10 12:14 UTCGHSA enrichment
  31. 2026-08-10 06:28 UTCGHSA enrichment
  32. 2026-08-10 02:04 UTCGHSA enrichment
  33. 2026-08-09 21:50 UTCGHSA enrichment
  34. 2026-08-09 17:36 UTCEG score recompute
  35. 2026-08-09 17:36 UTCGHSA enrichment
  36. 2026-08-09 13:46 UTCEPSS rescore
  37. 2026-08-09 13:23 UTCGHSA enrichment
  38. 2026-08-09 06:58 UTCEG score recompute
  39. 2026-08-09 06:58 UTCGHSA enrichment
  40. 2026-08-08 16:37 UTCEPSS rescore
  41. 2026-08-08 10:22 UTCGHSA enrichment
  42. 2026-08-08 06:09 UTCGHSA enrichment
  43. 2026-08-08 01:56 UTCGHSA enrichment
  44. 2026-08-07 21:43 UTCGHSA enrichment
  45. 2026-08-07 17:30 UTCEG score recompute
  46. 2026-08-07 17:30 UTCGHSA enrichment
  47. 2026-08-06 19:29 UTCEG score recompute
  48. 2026-08-06 19:29 UTCGHSA enrichment
  49. 2026-08-06 13:46 UTCEPSS rescore
  50. 2026-08-06 10:28 UTCGHSA enrichment
  51. 2026-08-06 05:50 UTCGHSA enrichment
  52. 2026-08-06 01:37 UTCEG score recompute
  53. 2026-08-06 01:37 UTCGHSA enrichment
  54. 2026-08-05 19:17 UTCEPSS rescore
  55. 2026-08-04 15:10 UTCEPSS rescore
  56. 2026-08-04 05:42 UTCGHSA enrichment
  57. 2026-08-04 00:48 UTCEG score recompute
  58. 2026-08-04 00:48 UTCGHSA enrichment
  59. 2026-08-03 10:36 UTCEPSS rescore
  60. 2026-08-03 01:14 UTCGHSA enrichment
  61. 2026-08-02 20:53 UTCGHSA enrichment
  62. 2026-08-02 16:40 UTCEG score recompute
  63. 2026-08-02 16:40 UTCGHSA enrichment
  64. 2026-08-01 04:16 UTCEPSS rescore
  65. 2026-07-30 16:27 UTCEPSS rescore
  66. 2026-07-30 01:30 UTCEPSS rescore
  67. 2026-07-28 15:36 UTCEPSS rescore
  68. 2026-07-27 14:41 UTCEG score recompute
  69. 2026-07-27 14:41 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-30704?
CVE-2026-30704 is a critical vulnerability published on March 18, 2026. The WiFi Extender WDR201A (HW V2.1, FW LFMZX28040922V1.02) exposes an unprotected UART interface through accessible hardware pads on the PCB
When was CVE-2026-30704 disclosed?
CVE-2026-30704 was first published in the National Vulnerability Database on March 18, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-30704 actively exploited?
CVE-2026-30704 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 76.3% of all scored CVEs.
What is the CVSS score of CVE-2026-30704?
CVE-2026-30704 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-30704?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-30704, 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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