CVE-2015-5296

MEDIUMNVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2022-05-14. NVD baseline CVSS 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 7%CVSS: 5.4Exploit: None knownExposed: 0

A fix is available — apply it.

Samba 3.x and 4.x before 4.1.22, 4.2.x before 4.2.7, and 4.3.x before 4.3.3 supports connections that are encrypted but unsigned, which allows man-in-the-middle attackers to conduct encrypted-to-unencrypted downgrade attacks by modifying the client-server data stream, related to clidfs.c, libsmb_server.c, and smbXcli_base.c.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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
Severity54% × 45%
Exploitation7% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
7%
EPSS %ILE
94%
KEV
Not listed

Published

December 29, 2015

Last Modified

May 6, 2026

References (50)

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntusamba (2:4.1.17+dfsg-4ubuntu3.1) @ wily2026-05-22ubuntu
redhatsamba-0:4.2.3-11.el7_22016-01-08redhat
redhatsamba-0:4.1.17-16.el6rhs2016-01-08redhat
redhatsamba-0:4.2.4-9.1.el7rhgs2016-01-08redhat
redhatsamba4-0:4.0.0-67.el6_7.rc42016-01-07redhat
redhatsamba-0:3.6.23-24.el6_72016-01-07redhat

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

(7 across 7 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
samba—2:4.1.22+dfsg-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
samba—2:4.1.22+dfsg-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
samba—2:4.1.22+dfsg-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
samba—2:4.1.22+dfsg-1—
Debian:6.0(1)
PackageVulnerable rangeFixed inDependents
samba2:3.5.6~dfsg-3 ... 2:3.5.6~dfsg-3squeeze9 (13 versions)2:3.5.6~dfsg-3squeeze13—
Debian:7(1)
PackageVulnerable rangeFixed inDependents
samba2:3.6.6-6 ... 2:3.6.6-6+deb7u5~bpo60+1 (10 versions)2:3.6.6-6+deb7u6—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
samba2:4.1.17+dfsg-22:4.1.17+dfsg-2+deb8u1—

All Vendor Advisories

(6)

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 6× in last 7d / 26× 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 121 total refreshes for this CVE.

  1. 2026-08-20 22:50 UTCEPSS rescore
  2. 2026-08-19 16:59 UTCEPSS rescore
  3. 2026-08-18 13:43 UTCEPSS rescore
  4. 2026-08-16 14:51 UTCEPSS rescore
  5. 2026-08-16 02:09 UTCEPSS rescore
  6. 2026-08-15 01:25 UTCEPSS rescore
  7. 2026-08-14 14:54 UTCOSV refresh
  8. 2026-08-12 13:46 UTCEPSS rescore
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  17. 2026-07-30 03:24 UTCOSV refresh
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  24. 2026-07-23 14:14 UTCEPSS rescore
  25. 2026-07-23 01:18 UTCEG score recompute
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  1. 2026-07-23 00:20 UTCEG score recompute
  2. 2026-07-22 21:59 UTCEG score recompute
  3. 2026-07-22 14:04 UTCEPSS rescore
  4. 2026-07-21 15:21 UTCEPSS rescore
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  6. 2026-07-20 17:03 UTCEPSS rescore
  7. 2026-07-19 14:27 UTCEPSS rescore
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  12. 2026-07-16 16:59 UTCEPSS rescore
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  16. 2026-07-13 22:26 UTCEPSS rescore
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  18. 2026-07-12 12:38 UTCOSV refresh
  19. 2026-07-12 05:42 UTCEPSS rescore
  20. 2026-07-11 08:23 UTCEPSS rescore
  21. 2026-07-09 19:05 UTCEPSS rescore
  22. 2026-07-09 19:05 UTCEPSS rescore
  23. 2026-07-08 15:10 UTCEPSS rescore
  24. 2026-07-07 13:42 UTCEPSS rescore
  25. 2026-07-07 13:42 UTCEPSS rescore
  26. 2026-07-06 16:24 UTCEPSS rescore
  27. 2026-07-06 02:20 UTCEPSS rescore
  28. 2026-07-05 02:26 UTCEPSS rescore
  29. 2026-07-04 06:28 UTCEPSS rescore
  30. 2026-07-01 15:02 UTCEPSS rescore
  31. 2026-06-30 23:19 UTCEPSS rescore
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  35. 2026-06-28 14:04 UTCEPSS rescore
  36. 2026-06-28 04:53 UTCEPSS rescore
  37. 2026-06-27 03:05 UTCEPSS rescore
  38. 2026-06-25 13:47 UTCEPSS rescore
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  40. 2026-06-24 14:02 UTCEPSS rescore
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  42. 2026-06-23 21:30 UTCEPSS rescore
  43. 2026-06-23 18:20 UTCOSV refresh
  44. 2026-06-22 14:23 UTCEPSS rescore
  45. 2026-06-22 14:23 UTCEPSS rescore
  46. 2026-06-19 19:23 UTCEPSS rescore
  47. 2026-06-19 19:23 UTCEPSS rescore
  48. 2026-06-18 17:50 UTCEPSS rescore
  49. 2026-06-17 17:50 UTCEPSS rescore
  50. 2026-06-17 17:49 UTCEPSS rescore
  51. 2026-06-16 17:50 UTCEPSS rescore
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  55. 2026-06-13 22:57 UTCEPSS rescore
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  63. 2026-06-07 15:22 UTCEPSS rescore
  64. 2026-06-07 01:29 UTCOSV refresh
  65. 2026-06-06 13:45 UTCEPSS rescore
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  74. 2026-05-31 22:28 UTCEPSS rescore
  75. 2026-05-31 22:28 UTCEPSS rescore

Frequently asked(5)

What is CVE-2015-5296?
CVE-2015-5296 is a medium vulnerability published on December 29, 2015. Samba 3.x and 4.x before 4.1.22, 4.2.x before 4.2.7, and 4.3.x before 4.3.3 supports connections that are encrypted but unsigned, which allows man-in-the-middle attackers to conduct encrypted-to-unencrypted downgrade attacks by modifying the client-server data stream, related to clidfs.c,…
When was CVE-2015-5296 disclosed?
CVE-2015-5296 was first published in the National Vulnerability Database on December 29, 2015, with the most recent update on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-5296 actively exploited?
CVE-2015-5296 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7% probability of exploitation in the next 30 days, which ranks it in the top 6.1% of all scored CVEs.
What is the CVSS score of CVE-2015-5296?
CVE-2015-5296 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2015-5296?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-5296, 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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