CVE-2025-66172

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 58% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.1Exploit: None knownExposed: 0

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

The CloudStack Backup plugin has an improper access logic in versions 4.21.0.0 and 4.22.0.0. Anyone with authenticated user-account access in CloudStack 4.21.0.0+ environments, where this plugin is enabled and have access to specific APIs can restore a volume from any other user's backups and attach the volume to their own VMs.

Backup plugin users using CloudStack 4.21.0.0+ are recommended to upgrade to CloudStack version 4.22.0.1, which fixes this issue.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

May 8, 2026

Last Modified

May 12, 2026

Advisory Details (2)

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

oss-security - CVE-2025-66172: Apache CloudStack: Any user can attach a volume in their VMs from backups they should not have access to

http://www.openwall.com/lists/oss-security/2026/05/09/3
generic
https://lists.apache.org/thread/n8mt5b7wkpysstb8w7rr9f02kc5cq2xm

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 30× 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 218 total refreshes for this CVE.

  1. 2026-09-15 03:10 UTCEPSS rescore
  2. 2026-09-13 16:46 UTCEPSS rescore
  3. 2026-09-12 15:00 UTCEPSS rescore
  4. 2026-09-11 14:52 UTCEPSS rescore
  5. 2026-09-11 09:36 UTCEPSS rescore
  6. 2026-09-10 09:34 UTCEPSS rescore
  7. 2026-09-08 22:00 UTCEPSS rescore
  8. 2026-09-07 16:00 UTCEPSS rescore
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-04 05:06 UTCEPSS rescore
  11. 2026-09-02 14:11 UTCEPSS rescore
  12. 2026-09-01 13:53 UTCEPSS rescore
  13. 2026-08-30 19:16 UTCEPSS rescore
  14. 2026-08-30 01:21 UTCEPSS rescore
  15. 2026-08-28 21:40 UTCEPSS rescore
  16. 2026-08-27 14:24 UTCEPSS rescore
  17. 2026-08-26 14:45 UTCEPSS rescore
  18. 2026-08-25 13:48 UTCEPSS rescore
  19. 2026-08-24 14:16 UTCEPSS rescore
  20. 2026-08-23 19:26 UTCEG score recompute
  21. 2026-08-23 19:26 UTCGHSA enrichment
  22. 2026-08-23 00:18 UTCEPSS rescore
  23. 2026-08-21 23:48 UTCEPSS rescore
  24. 2026-08-20 22:55 UTCEPSS rescore
  25. 2026-08-19 17:03 UTCEPSS rescore
Show 75 more
  1. 2026-08-18 13:47 UTCEPSS rescore
  2. 2026-08-17 13:46 UTCEPSS rescore
  3. 2026-08-17 11:58 UTCEG score recompute
  4. 2026-08-17 11:58 UTCGHSA enrichment
  5. 2026-08-16 14:55 UTCEPSS rescore
  6. 2026-08-16 04:39 UTCEG score recompute
  7. 2026-08-16 04:39 UTCGHSA enrichment
  8. 2026-08-16 02:13 UTCEPSS rescore
  9. 2026-08-15 01:30 UTCEPSS rescore
  10. 2026-08-15 01:29 UTCEPSS rescore
  11. 2026-08-14 15:37 UTCGHSA enrichment
  12. 2026-08-14 03:14 UTCEG score recompute
  13. 2026-08-14 03:14 UTCGHSA enrichment
  14. 2026-08-13 21:59 UTCEPSS rescore
  15. 2026-08-13 06:00 UTCGHSA enrichment
  16. 2026-08-12 16:50 UTCEG score recompute
  17. 2026-08-12 16:50 UTCGHSA enrichment
  18. 2026-08-12 13:50 UTCEPSS rescore
  19. 2026-08-11 15:53 UTCEG score recompute
  20. 2026-08-11 15:53 UTCGHSA enrichment
  21. 2026-08-11 13:42 UTCEPSS rescore
  22. 2026-08-11 01:20 UTCEG score recompute
  23. 2026-08-11 01:20 UTCGHSA enrichment
  24. 2026-08-10 23:59 UTCEPSS rescore
  25. 2026-08-10 03:11 UTCGHSA enrichment
  26. 2026-08-09 14:49 UTCEG score recompute
  27. 2026-08-09 14:49 UTCGHSA enrichment
  28. 2026-08-09 13:46 UTCEPSS rescore
  29. 2026-08-09 13:46 UTCEPSS rescore
  30. 2026-08-09 02:27 UTCEG score recompute
  31. 2026-08-09 02:27 UTCGHSA enrichment
  32. 2026-08-08 16:36 UTCEPSS rescore
  33. 2026-08-08 02:31 UTCEG score recompute
  34. 2026-08-08 02:31 UTCGHSA enrichment
  35. 2026-08-07 16:26 UTCEPSS rescore
  36. 2026-08-07 14:08 UTCGHSA enrichment
  37. 2026-08-07 01:46 UTCEG score recompute
  38. 2026-08-07 01:46 UTCGHSA enrichment
  39. 2026-08-06 13:46 UTCEPSS rescore
  40. 2026-08-06 10:44 UTCGHSA enrichment
  41. 2026-08-05 22:10 UTCEG score recompute
  42. 2026-08-05 22:10 UTCGHSA enrichment
  43. 2026-08-05 19:17 UTCEPSS rescore
  44. 2026-08-05 19:17 UTCEPSS rescore
  45. 2026-08-04 15:09 UTCEPSS rescore
  46. 2026-08-04 10:37 UTCEPSS rescore
  47. 2026-08-03 19:33 UTCEG score recompute
  48. 2026-08-03 19:33 UTCGHSA enrichment
  49. 2026-08-03 10:35 UTCEPSS rescore
  50. 2026-08-03 04:27 UTCGHSA enrichment
  51. 2026-08-02 15:48 UTCGHSA enrichment
  52. 2026-08-02 03:25 UTCEG score recompute
  53. 2026-08-02 03:25 UTCGHSA enrichment
  54. 2026-08-02 02:26 UTCEPSS rescore
  55. 2026-08-01 04:15 UTCEPSS rescore
  56. 2026-07-30 16:27 UTCEPSS rescore
  57. 2026-07-30 01:30 UTCEPSS rescore
  58. 2026-07-28 15:35 UTCEPSS rescore
  59. 2026-07-27 14:12 UTCEPSS rescore
  60. 2026-07-26 14:54 UTCEPSS rescore
  61. 2026-07-26 14:54 UTCEPSS rescore
  62. 2026-07-25 14:17 UTCEPSS rescore
  63. 2026-07-24 14:17 UTCEPSS rescore
  64. 2026-07-24 14:17 UTCEPSS rescore
  65. 2026-07-23 14:18 UTCEPSS rescore
  66. 2026-07-23 14:18 UTCEPSS rescore
  67. 2026-07-23 03:01 UTCEG score recompute▲ 1.60
  68. 2026-07-22 14:08 UTCEPSS rescore
  69. 2026-07-21 15:24 UTCEPSS rescore
  70. 2026-07-20 17:08 UTCEPSS rescore
  71. 2026-07-19 14:30 UTCEPSS rescore
  72. 2026-07-19 14:30 UTCEPSS rescore
  73. 2026-07-19 02:28 UTCEPSS rescore
  74. 2026-07-18 10:04 UTCEPSS rescore
  75. 2026-07-18 10:04 UTCEPSS rescore

Frequently asked(5)

What is CVE-2025-66172?
CVE-2025-66172 is a high vulnerability published on May 8, 2026. The CloudStack Backup plugin has an improper access logic in versions 4.21.0.0 and 4.22.0.0. Anyone with authenticated user-account access in CloudStack 4.21.0.0+ environments, where this plugin is enabled and have access to specific APIs can restore a volume from any other user's backups and…
When was CVE-2025-66172 disclosed?
CVE-2025-66172 was first published in the National Vulnerability Database on May 8, 2026, with the most recent update on May 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-66172 actively exploited?
CVE-2025-66172 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.9% of all scored CVEs.
What is the CVSS score of CVE-2025-66172?
CVE-2025-66172 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2025-66172?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-66172, 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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