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
7.3EG
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: None knownExposed: 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)
EG Risk
48(Track)
EG Risk 48/100SSVC: 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
Severity73% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

June 3, 2026

Last Modified

July 22, 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 14× in last 7d / 90× 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 219 total refreshes for this CVE.

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

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 July 22, 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 0% probability of exploitation in the next 30 days, which ranks it in the top 94.0% of all scored CVEs.
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.

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