CVE-2026-6644

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-20. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.1Exploit: NoneExposed: 0

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

A command injection vulnerability was found in the PPTP VPN Clients on the ADM. The vulnerability allows an administrative user to break out of the restricted web environment and execute arbitrary code on the underlying operating system. This occurs due to insufficient validation of user-supplied input before it is passed to a system shell. Successful exploitation allows an attacker to achieve Remote Code Execution (RCE) and fully compromise the system. Affected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RR42 as well as from ADM 5.0.0 through ADM 5.1.2.REO1.

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
70.4%
KEV
Not listed

Published

April 20, 2026

Last Modified

April 30, 2026

Advisory Details (1)

Auto-updated May 2, 2026
No patch confirmed yet.
generic

CVE-2026-6644: A Now-Fixed Critical Zero-Day Authenticated RCE in ASUSTOR ADM PPTP VPN Client | CVE-2026-6644

https://uky007.github.io/CVE-2026-6644/

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 43× 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 163 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-6644?
CVE-2026-6644 is a critical vulnerability published on April 20, 2026. A command injection vulnerability was found in the PPTP VPN Clients on the ADM. The vulnerability allows an administrative user to break out of the restricted web environment and execute arbitrary code on the underlying operating system. This occurs due to insufficient validation of user-supplied…
When was CVE-2026-6644 disclosed?
CVE-2026-6644 was first published in the National Vulnerability Database on April 20, 2026, with the most recent update on April 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6644 actively exploited?
CVE-2026-6644 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 70.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-6644?
CVE-2026-6644 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-6644?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6644, 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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