CVE-2026-36609

HIGHPre-NVD 7.37.3—
EchelonGraph scoreMEDIUM confidence

Score 7.3 from GitHub Security Advisory (severity: HIGH) published 2026-06-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
7.3
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.3Exploit: NoneExposed: 0

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

Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 uses a static authentication nonce that does not change between requests from the same source IP. Combined with the predictable XOR-based password encoding (securityEncode function), this allows an attacker to reverse captured authentication tokens to recover the plaintext password.

CVSS v3
7.3
EG Score
7.3(medium)
EPSS
6.1%
KEV
Not listed

Published

June 3, 2026

Last Modified

June 4, 2026

Advisory Details (1)

Auto-updated Jun 9, 2026
No patch confirmed yet.
generic

MERCUSYS-AC12G/advisories/CVE-2026-36609.md at master · Tymbark7372/MERCUSYS-AC12G · GitHub

https://github.com/Tymbark7372/MERCUSYS-AC12G/blob/master/advisories/CVE-2026-36609.md

Vendor Advisories for CVE-2026-36609(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 129× 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 140 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-36609?
CVE-2026-36609 is a high vulnerability published on June 3, 2026. Mercusys AC12G (EU) V1 router with firmware AC12G(EU)V1200909 uses a static authentication nonce that does not change between requests from the same source IP. Combined with the predictable XOR-based password encoding (securityEncode function), this allows an attacker to reverse captured…
When was CVE-2026-36609 disclosed?
CVE-2026-36609 was first published in the National Vulnerability Database on June 3, 2026, with the most recent update on June 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-36609 actively exploited?
CVE-2026-36609 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-36609?
CVE-2026-36609 has a CVSS v3.1 base score of 7.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-36609?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-36609, 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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