CVE-2025-0620

MEDIUMNVD 4.96.6▲
EchelonGraph scoreMEDIUM confidence

Score 6.6 from GitHub Security Advisory published 2025-06-06. NVD baseline CVSS 4.9; sources differ by 1.7.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.6EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 4.9Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in Samba. The smbd service daemon does not pick up group membership changes when re-authenticating an expired SMB session. This issue can expose file shares until clients disconnect and then connect again.

CVSS v3
4.9
EG Score
6.6(medium)
EG Risk
30(Track)
EG Risk 30/100SSVC: 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
Severity66% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
53%
KEV
Not listed

Published

June 6, 2025

Last Modified

August 31, 2026

Advisory Details (4)

Auto-updated Jun 25, 2026
Patch available. Sources: redhat.
generic

oss-security - Samba 4.21.6 fixes CVE-2025-0620 in SMB session re-authentication

http://www.openwall.com/lists/oss-security/2025/06/03/8
generic

Samba - Security Announcement Archive

https://www.samba.org/samba/security/CVE-2025-0620.html
redhat Patch Available

2370453 – (CVE-2025-0620) CVE-2025-0620 samba: smbd doesn't pick up group membership changes when re-authenticating an expired SMB session

https://bugzilla.redhat.com/show_bug.cgi?id=2370453
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2025-0620

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuwinbind (2:4.21.4+dfsg-1ubuntu3.1) @ plucky2026-08-31ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 5 ecosystems)
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
samba—4.21.6-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
samba—4.21.6-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
samba—4.21.6-r0—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
samba—2:4.22.2+dfsg-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
samba—2:4.22.2+dfsg-1—

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 40× 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 162 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2025-0620?
CVE-2025-0620 is a medium vulnerability published on June 6, 2025. A flaw was found in Samba. The smbd service daemon does not pick up group membership changes when re-authenticating an expired SMB session. This issue can expose file shares until clients disconnect and then connect again.
When was CVE-2025-0620 disclosed?
CVE-2025-0620 was first published in the National Vulnerability Database on June 6, 2025, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-0620 actively exploited?
CVE-2025-0620 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 46.7% of all scored CVEs.
What is the CVSS score of CVE-2025-0620?
CVE-2025-0620 has a CVSS v3 base score of 4.9 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.6.
How do I remediate CVE-2025-0620?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-0620, 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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