samba: Weak authentication protocol regression
Published Aug 22, 2018
8.1
HIGHCVSS 3.1
EPSS 3.10%
Description
A flaw was found in the way samba before 4.7.9 and 4.8.4 allowed the use of weak NTLMv1 authentication even when NTLMv1 was explicitly disabled. A man-in-the-middle attacker could use this flaw to read the credential and other details passed between the samba server and client.
Affected products
-
- Version before 4.7.9StatusaffectedConstraints-
- Version before 4.8.4StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| The Samba Team | Samba | n/a |
|
Configuration 1
Configuration 2
- 14.04
- 16.04
- 18.04
- 7.0
- 7.0
- 7.0
No data.
Red Hat Enterprise Linux 7
samba-0:4.8.3-4.el7
Fixed · RHSA-2018:3056
Red Hat Gluster Storage 3.4 for RHEL 6
libtalloc-0:2.1.11-1.el6rhs
Fixed · RHSA-2018:2612
Red Hat Gluster Storage 3.4 for RHEL 6
libtdb-0:1.3.15-4.el6rhs
Fixed · RHSA-2018:2612
Red Hat Gluster Storage 3.4 for RHEL 6
libtevent-0:0.9.35-1.el6rhs
Fixed · RHSA-2018:2612
Red Hat Gluster Storage 3.4 for RHEL 6
samba-0:4.7.5-110.el6rhs
Fixed · RHSA-2018:2612
Red Hat Gluster Storage 3.4 for RHEL 7
libtalloc-0:2.1.11-1.el7rhgs
Fixed · RHSA-2018:2613
Red Hat Gluster Storage 3.4 for RHEL 7
libtdb-0:1.3.15-4.el7rhgs
Fixed · RHSA-2018:2613
Red Hat Gluster Storage 3.4 for RHEL 7
libtevent-0:0.9.35-1.el7rhgs
Fixed · RHSA-2018:2613
Red Hat Gluster Storage 3.4 for RHEL 7
samba-0:4.7.5-110.el7rhgs
Fixed · RHSA-2018:2613
Red Hat Enterprise Linux 5
samba
Not affected
Red Hat Enterprise Linux 5
samba3x
Not affected
Red Hat Enterprise Linux 6
samba
Not affected
Red Hat Enterprise Linux 6
samba4
Not affected
Red Hat Enterprise Linux 8
samba
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | samba-0:4.8.3-4.el7 | Fixed | RHSA-2018:3056 |
| Red Hat Gluster Storage 3.4 for RHEL 6 | libtalloc-0:2.1.11-1.el6rhs | Fixed | RHSA-2018:2612 |
| Red Hat Gluster Storage 3.4 for RHEL 6 | libtdb-0:1.3.15-4.el6rhs | Fixed | RHSA-2018:2612 |
| Red Hat Gluster Storage 3.4 for RHEL 6 | libtevent-0:0.9.35-1.el6rhs | Fixed | RHSA-2018:2612 |
| Red Hat Gluster Storage 3.4 for RHEL 6 | samba-0:4.7.5-110.el6rhs | Fixed | RHSA-2018:2612 |
| Red Hat Gluster Storage 3.4 for RHEL 7 | libtalloc-0:2.1.11-1.el7rhgs | Fixed | RHSA-2018:2613 |
| Red Hat Gluster Storage 3.4 for RHEL 7 | libtdb-0:1.3.15-4.el7rhgs | Fixed | RHSA-2018:2613 |
| Red Hat Gluster Storage 3.4 for RHEL 7 | libtevent-0:0.9.35-1.el7rhgs | Fixed | RHSA-2018:2613 |
| Red Hat Gluster Storage 3.4 for RHEL 7 | samba-0:4.7.5-110.el7rhgs | Fixed | RHSA-2018:2613 |
| Red Hat Enterprise Linux 5 | samba | Not affected | n/a |
| Red Hat Enterprise Linux 5 | samba3x | Not affected | n/a |
| Red Hat Enterprise Linux 6 | samba | Not affected | n/a |
| Red Hat Enterprise Linux 6 | samba4 | Not affected | n/a |
| Red Hat Enterprise Linux 8 | samba | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
AV:N/AC:M/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (19 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.10% (0.03105) | 87.31th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.10% (0.03105) | 86.03th | v5 (v2026.06.15) |
| Nov 30, 2025 | 1.53% (0.01526) | 80.72th | v4 (v2025.03.14) |
| Nov 21, 2025 | 2.60% (0.02605) | 85.12th | v4 (v2025.03.14) |
| Nov 18, 2025 | 1.12% (0.01123) | 76.41th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.17% (0.02171) | 83.17th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.64% (0.00638) | 79.86th | v3 (v2023.03.01) |
| Apr 17, 2024 | 0.64% (0.00638) | 78.91th | v3 (v2023.03.01) |
| Jan 13, 2024 | 0.64% (0.00638) | 76.90th | v3 (v2023.03.01) |
| Aug 16, 2023 | 0.73% (0.00730) | 78.33th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.89% (0.00891) | 80.14th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.54% (0.01537) | 74.52th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.54% (0.01537) | 74.48th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.54% (0.01537) | 72.41th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.54% (0.01537) | 51.33th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.07% (0.02069) | 50.36th | v1 |
| Jan 6, 2022 | 2.07% (0.02069) | 49.86th | v1 |
| Sep 1, 2021 | 2.07% (0.02069) | 77.27th | v1 |
| Apr 14, 2021 | 2.07% (0.02069) | 0.00th | v1 |
References (13)
- http://www.securityfocus.com/bid/105084 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2018:2612 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2613 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3056 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2018-1139 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1589651 Issue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1139 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-1139
- https://security.gentoo.org/glsa/202003-52 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://security.netapp.com/advisory/ntap-20180814-0001/ x_refsource_CONFIRMThird Party Advisory
- https://usn.ubuntu.com/3738-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-1139
- https://www.samba.org/samba/security/CVE-2018-1139.html x_refsource_CONFIRMThird Party Advisory
Change history (0)
No recorded changes yet.