Critical
Security advisory
Libntlm through 1.5 relies on a fixed buffer size for tSmbNtlmAuthRequest, tSmbNtlmAuthChallenge, and tSmbNtlmAuthResponse read and write operations, as demonstrated by a stack-based buffer over-read in buildSmbNtlmAuthRequest in smbutil.c for a crafted NTLM request.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2019-17455
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 10:38 UTC · Revision 1
Source evidence
Libntlm through 1.5 relies on a fixed buffer size for tSmbNtlmAuthRequest, tSmbNtlmAuthChallenge, and tSmbNtlmAuthResponse read and write operations, as demonstrated by a stack-based buffer over-read in buildSmbNtlmAuthRequest in smbutil.c for a crafted NTLM request.
osv:CVE-2019-17455
Complete source record
{
"id": "7588de6edff96ed29159e347c8bf551a47c49df999f04ab2b475a2f2a046e482",
"url": "https://osv.dev/vulnerability/CVE-2019-17455",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2019-17455",
"summary": "Libntlm through 1.5 relies on a fixed buffer size for tSmbNtlmAuthRequest, tSmbNtlmAuthChallenge, and tSmbNtlmAuthResponse read and write operations, as demonstrated by a stack-based buffer over-read in buildSmbNtlmAuthRequest in smbutil.c for a crafted NTLM request.",
"evidence": "osv:CVE-2019-17455",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2019-17455",
"aliases": [
"CVE-2019-17455"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://gitlab.com/jas/libntlm",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "8adf90b0bf2ca8cc55c7cd655d566fd1a74bf90a"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:nongnu:libntlm:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"last_affected": "1.5"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"libntlm-1-5",
"libntlm-1-4",
"libntlm-1-3",
"libntlm-1-2",
"libntlm-1-1",
"libntlm-1-0",
"libntlm-0-4-2",
"libntlm-0-4-1",
"libntlm-0-4-0",
"libntlm-0-3-13",
"libntlm-0-3-12",
"libntlm-0-3-11",
"libntlm-0-3-10",
"libntlm-0-3-9",
"libntlm-0-3-8",
"libntlm-0-3-7",
"libntlm-0-3-6",
"libntlm-0-3-5",
"libntlm-0-3-4",
"libntlm-0-3-3",
"libntlm-0-3-2",
"libntlm-0-3-1",
"libntlm-0-3-0",
"libntlm-0-21",
"libntlm-0-2",
"libntlm-0-1",
"libntlm-0-0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-17455.json"
}
}
],
"modified": "2026-10-20T10:50:49.554517661Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3BVFO3OVJPMSGIXBKNOCVOJZ3UTGZQF5/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YZ5YWYNOJ5HMCKAHWLTY4MXZQWJJCBI7/",
"https://lists.debian.org/debian-lts-announce/2020/05/msg00010.html",
"https://lists.debian.org/debian-lts-announce/2021/11/msg00026.html",
"https://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-17455.html",
"https://security-tracker.debian.org/tracker/CVE-2019-17455",
"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=942145",
"https://gitlab.com/jas/libntlm/issues/2"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*: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"
},
{
"introduced": "20.04"
},
{
"last_affected": "20.04"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
},
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "32"
},
{
"last_affected": "32"
},
{
"introduced": "33"
},
{
"last_affected": "33"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:opensuse:backports_sle:15.0:sp1:*:*:*:*:*:*"
],
"vendor_product": "opensuse:backports_sle",
"extracted_events": [
{
"range": [
{
"introduced": "15.0-sp1"
},
{
"last_affected": "15.0-sp1"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*"
],
"vendor_product": "opensuse:leap",
"extracted_events": [
{
"range": [
{
"introduced": "15.1"
},
{
"last_affected": "15.1"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2019-17455",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 382212,
"published_at": "2019-10-10T18:15:11.647+00:00"
}