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No exploitation reportedFix available

CVE-2017-12151

No exploitation reported by the sources we read.

  • Published2018-07-27
  • Fixed in4.6.8 · 4.5.14 · 4.4.16
  • WeaknessCWE-300 · CWE-310

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A flaw was found in the way samba client before samba 4.4.16, samba 4.5.14 and samba 4.6.8 used encryption with the max protocol set as SMB3. The connection could lose the requirement for signing and encrypting to any DFS redirects, allowing an attacker to read or alter the contents of the connection via a man-in-the-middle attack.

Timeline

dates in UTC
  1. 2018-07-2712:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-12151?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-12151?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Samba
BranchAffectedFixed in
4.6≥ 4.6.0, < 4.6.84.6.8
4.5≥ 4.5.0, < 4.5.144.5.14
4.4< 4.4.164.4.16
Debian debian linux
BranchAffectedFixed in
8.0= 8.0no fix published
9.0= 9.0no fix published
Redhat enterprise linux server eus
BranchAffectedFixed in
7.4= 7.4no fix published
7.5= 7.5no fix published

5 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Samba to 4.6.8 · 4.5.14 · 4.4.16

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CNACVSS 3.07.4read 2026-10-23
  • NVDCVSS 3.07.4read 2026-10-23
  • NVDCVSS 2.05.8read 2026-10-23
  • CNAweakness (CWE)CWE-300read 2026-10-23
  • NVDweakness (CWE)CWE-310read 2026-10-23
  • FIRST EPSSEPSS score4.1 %2026-10-22

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
2018-07-27
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2017-12151?

A flaw was found in the way samba client before samba 4.4.16, samba 4.5.14 and samba 4.6.8 used encryption with the max protocol set as SMB3. The connection could lose the requirement for signing and encrypting to any DFS redirects, allowing an attacker to read or alter the contents of the connection via a man-in-the-middle attack.

Is CVE-2017-12151 actively exploited?

Active exploitation of CVE-2017-12151 has not been confirmed. Its EPSS score was 4.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-12151?

CVE-2017-12151 has a CVSS v3 base score of 7.4 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

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