CVE-2026-36539

HIGHNVD 7.37.3—
EchelonGraph scoreMEDIUM confidence

Score 7.3 from GitHub Security Advisory (severity: HIGH) published 2026-05-27. NVD baseline CVSS 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.3Exploit: Elevated riskExposed: 0

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

Netis AC1200 Router NC21 V4.0.1.4296 exposes a CGI endpoint /cgi-bin/skk_get.cgi that returns the entire router configuration as a JSON response with no authentication required. Any attacker on the LAN can send a single HTTP GET request and instantly retrieve administrator credentials, WiFi passwords, PPPoE credentials, DDNS credentials, and a full map of all connected devices.

CVSS v3
7.3
EG Score
7.3(medium)
EG Risk
64(Attend)
EG Risk 64/100SSVC: Attend

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
Severity73% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

May 27, 2026

Last Modified

May 28, 2026

Advisory Details (1)

Auto-updated Jun 11, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

cve-disclosure/CVE-2026-36539/readme.md at main · sir3ns/cve-disclosure · GitHub

https://github.com/sir3ns/cve-disclosure/blob/main/CVE-2026-36539/readme.md

Vendor Advisories for CVE-2026-36539(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 34× 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.

Showing the most recent 100 of 232 total refreshes for this CVE.

  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-15 03:11 UTCEPSS rescore
  3. 2026-09-14 09:34 UTCEG score recompute
  4. 2026-09-14 09:34 UTCGHSA enrichment
  5. 2026-09-13 16:47 UTCEPSS rescore
  6. 2026-09-12 15:01 UTCEPSS rescore
  7. 2026-09-11 14:53 UTCEPSS rescore
  8. 2026-09-11 09:37 UTCEPSS rescore
  9. 2026-09-10 09:34 UTCEPSS rescore
  10. 2026-09-08 22:00 UTCEPSS rescore
  11. 2026-09-07 16:01 UTCEPSS rescore
  12. 2026-09-06 13:47 UTCEPSS rescore
  13. 2026-09-04 05:06 UTCEPSS rescore
  14. 2026-09-02 14:12 UTCEPSS rescore
  15. 2026-09-01 13:53 UTCEPSS rescore
  16. 2026-09-01 04:39 UTCEPSS rescore
  17. 2026-08-30 19:17 UTCEPSS rescore
  18. 2026-08-30 01:22 UTCEPSS rescore
  19. 2026-08-28 21:41 UTCEPSS rescore
  20. 2026-08-27 14:25 UTCEPSS rescore
  21. 2026-08-26 14:46 UTCEPSS rescore
  22. 2026-08-25 13:49 UTCEPSS rescore
  23. 2026-08-23 15:53 UTCEG score recompute
  24. 2026-08-23 15:53 UTCGHSA enrichment
  25. 2026-08-23 00:19 UTCEPSS rescore
Show 75 more
  1. 2026-08-21 23:49 UTCEPSS rescore
  2. 2026-08-21 21:17 UTCEG score recompute
  3. 2026-08-21 21:17 UTCGHSA enrichment
  4. 2026-08-20 22:55 UTCEPSS rescore
  5. 2026-08-20 17:56 UTCEG score recompute
  6. 2026-08-20 17:56 UTCGHSA enrichment
  7. 2026-08-19 17:03 UTCEPSS rescore
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-17 13:47 UTCEPSS rescore
  10. 2026-08-17 09:29 UTCGHSA enrichment
  11. 2026-08-16 16:29 UTCEG score recompute
  12. 2026-08-16 16:29 UTCGHSA enrichment
  13. 2026-08-16 14:56 UTCEPSS rescore
  14. 2026-08-16 03:01 UTCEG score recompute
  15. 2026-08-16 03:01 UTCGHSA enrichment
  16. 2026-08-16 02:14 UTCEPSS rescore
  17. 2026-08-15 01:57 UTCEG score recompute
  18. 2026-08-15 01:57 UTCGHSA enrichment
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-14 13:48 UTCGHSA enrichment
  21. 2026-08-14 01:39 UTCEG score recompute
  22. 2026-08-14 01:39 UTCGHSA enrichment
  23. 2026-08-13 22:00 UTCEPSS rescore
  24. 2026-08-13 02:07 UTCGHSA enrichment
  25. 2026-08-12 13:58 UTCEG score recompute
  26. 2026-08-12 13:58 UTCGHSA enrichment
  27. 2026-08-12 13:51 UTCEPSS rescore
  28. 2026-08-12 01:49 UTCEG score recompute
  29. 2026-08-12 01:49 UTCGHSA enrichment
  30. 2026-08-11 13:39 UTCGHSA enrichment
  31. 2026-08-11 00:19 UTCEG score recompute
  32. 2026-08-11 00:19 UTCGHSA enrichment
  33. 2026-08-11 00:00 UTCEPSS rescore
  34. 2026-08-10 11:40 UTCGHSA enrichment
  35. 2026-08-09 23:29 UTCEG score recompute
  36. 2026-08-09 23:28 UTCGHSA enrichment
  37. 2026-08-09 13:46 UTCEPSS rescore
  38. 2026-08-09 11:19 UTCGHSA enrichment
  39. 2026-08-08 23:07 UTCEG score recompute
  40. 2026-08-08 23:07 UTCGHSA enrichment
  41. 2026-08-08 16:37 UTCEPSS rescore
  42. 2026-08-08 09:47 UTCGHSA enrichment
  43. 2026-08-07 21:38 UTCEG score recompute
  44. 2026-08-07 21:38 UTCGHSA enrichment
  45. 2026-08-07 09:28 UTCGHSA enrichment
  46. 2026-08-06 21:18 UTCEG score recompute
  47. 2026-08-06 21:18 UTCGHSA enrichment
  48. 2026-08-06 13:46 UTCEPSS rescore
  49. 2026-08-06 09:09 UTCGHSA enrichment
  50. 2026-08-05 21:00 UTCEG score recompute
  51. 2026-08-05 21:00 UTCGHSA enrichment
  52. 2026-08-05 19:17 UTCEPSS rescore
  53. 2026-08-04 15:10 UTCEPSS rescore
  54. 2026-08-04 10:38 UTCEPSS rescore
  55. 2026-08-04 04:59 UTCGHSA enrichment
  56. 2026-08-03 16:50 UTCEG score recompute
  57. 2026-08-03 16:50 UTCGHSA enrichment
  58. 2026-08-03 10:36 UTCEPSS rescore
  59. 2026-08-03 04:41 UTCGHSA enrichment
  60. 2026-08-02 16:32 UTCGHSA enrichment
  61. 2026-08-02 04:23 UTCEG score recompute
  62. 2026-08-02 04:23 UTCGHSA enrichment
  63. 2026-08-02 02:27 UTCEPSS rescore
  64. 2026-08-01 16:11 UTCEG score recompute
  65. 2026-08-01 16:11 UTCGHSA enrichment
  66. 2026-08-01 04:16 UTCEPSS rescore
  67. 2026-07-31 09:19 UTCEG score recompute
  68. 2026-07-31 09:19 UTCGHSA enrichment
  69. 2026-07-30 16:28 UTCEPSS rescore
  70. 2026-07-30 01:30 UTCEPSS rescore
  71. 2026-07-29 16:30 UTCEG score recompute
  72. 2026-07-29 16:30 UTCGHSA enrichment
  73. 2026-07-27 14:13 UTCEPSS rescore
  74. 2026-07-26 14:54 UTCEPSS rescore
  75. 2026-07-26 14:54 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-36539?
CVE-2026-36539 is a high vulnerability published on May 27, 2026. Netis AC1200 Router NC21 V4.0.1.4296 exposes a CGI endpoint /cgi-bin/skk_get.cgi that returns the entire router configuration as a JSON response with no authentication required. Any attacker on the LAN can send a single HTTP GET request and instantly retrieve administrator credentials, WiFi…
When was CVE-2026-36539 disclosed?
CVE-2026-36539 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on May 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-36539 actively exploited?
CVE-2026-36539 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 70.7% of all scored CVEs.
What is the CVSS score of CVE-2026-36539?
CVE-2026-36539 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-36539?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-36539, 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.

Dependency Blast Radius

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