CVE-2025-66592

MEDIUMNVD 5.66.1▲
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory published 2026-05-27. NVD baseline CVSS 5.6; sources differ by 0.5.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.6Exploit: None knownExposed: 0

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

An origin validation error vulnerability in Synology Active Backup for Business Agent before 3.1.0-4967 allows local users to write arbitrary files with restricted content and conduct denial-of-service during installation.

CVSS v3
5.6
EG Score
6.1(medium)
EG Risk
27(Track)
EG Risk 27/100SSVC: 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
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
0%
KEV
Not listed

Published

May 27, 2026

Last Modified

June 2, 2026

Advisory Details (1)

Auto-updated Jun 13, 2026
No patch confirmed yet.
generic

Synology_SA_25_16 | Synology Inc.

https://www.synology.com/en-global/security/advisory/Synology_SA_25_16

Vendor Advisories for CVE-2025-66592(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 7× in last 7d / 29× 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 172 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2025-66592?
CVE-2025-66592 is a medium vulnerability published on May 27, 2026. An origin validation error vulnerability in Synology Active Backup for Business Agent before 3.1.0-4967 allows local users to write arbitrary files with restricted content and conduct denial-of-service during installation.
When was CVE-2025-66592 disclosed?
CVE-2025-66592 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on June 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-66592 actively exploited?
CVE-2025-66592 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 99.6% of all scored CVEs.
What is the CVSS score of CVE-2025-66592?
CVE-2025-66592 has a CVSS v3 base score of 5.6 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.1.
How do I remediate CVE-2025-66592?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-66592, 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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