High
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-1139
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:39 UTC · Revision 1
Source evidence
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.
osv:CVE-2018-1139
Complete source record
{
"id": "71122b87353f97073011749c260f16ef36edbe59a20f8f8cfc520013fd1adb61",
"url": "https://osv.dev/vulnerability/CVE-2018-1139",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-1139",
"summary": "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.",
"evidence": "osv:CVE-2018-1139",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2018-1139",
"aliases": [
"CVE-2018-1139"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/samba-team/samba",
"type": "GIT",
"events": [
{
"introduced": "d1e69845e28c20a491c4cd60c712b46ddfcb9dc0"
},
{
"fixed": "3e5da7e8878a78da96fbdccd05953c791560a6b5"
},
{
"introduced": "5a9d09fee44052e18ce241ec28f78498d2e20d73"
},
{
"fixed": "626c489c2c879aef8b82efe9f7e832cca0183f4d"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.7.0"
},
{
"fixed": "4.7.9"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.8.0"
},
{
"fixed": "4.8.4"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"samba-4.7.8",
"ldb-1.3.5",
"samba-4.8.3",
"ldb-1.3.4",
"samba-4.8.2",
"ldb-1.3.3",
"samba-4.8.1",
"samba-4.7.7",
"samba-4.8.0",
"samba-4.7.5",
"samba-4.7.4",
"ldb-1.2.3",
"samba-4.7.2",
"samba-4.7.1",
"samba-4.7.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-1139.json"
}
}
],
"modified": "2026-10-24T10:30:56.212847652Z",
"provider": "osv",
"references": [
"https://access.redhat.com/errata/RHSA-2018:2612",
"https://access.redhat.com/errata/RHSA-2018:2613",
"https://access.redhat.com/errata/RHSA-2018:3056",
"https://security.gentoo.org/glsa/202003-52",
"https://security.netapp.com/advisory/ntap-20180814-0001/",
"https://usn.ubuntu.com/3738-1/",
"https://www.samba.org/samba/security/CVE-2018-1139.html",
"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1139"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "14.04"
},
{
"last_affected": "14.04"
},
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
},
{
"introduced": "18.04"
},
{
"last_affected": "18.04"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_desktop",
"extracted_events": [
{
"range": [
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_server",
"extracted_events": [
{
"range": [
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_workstation",
"extracted_events": [
{
"range": [
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2018-1139",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 438608,
"published_at": "2018-08-22T14:29:00.363+00:00"
}