MediumFix available
samba — security advisory
A flaw was found in samba. A race condition in the password lockout code may lead to the risk of brute force attacks being successful if special conditions are met.
- Products
- samba
- Affected versions
- Not specified
- Fixed versions
- 2:4.17.2+dfsg-3
- CVEs
- CVE-2021-20251
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 00:57 UTC · Revision 1
Source evidence
A flaw was found in samba. A race condition in the password lockout code may lead to the risk of brute force attacks being successful if special conditions are met.
osv:DEBIAN-CVE-2021-20251
samba
Fixed versions: 2:4.17.2+dfsg-3
samba
Fixed versions: 2:4.17.2+dfsg-3
samba
Fixed versions: 2:4.17.2+dfsg-3
Complete source record
{
"id": "db5ed10bb0348316834ebb795635501568891863e6795f3858526162bd12ff3d",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2021-20251",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2021-20251",
"summary": "A flaw was found in samba. A race condition in the password lockout code may lead to the risk of brute force attacks being successful if special conditions are met.",
"evidence": "osv:DEBIAN-CVE-2021-20251",
"products": [
{
"name": {
"value": "samba",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.17.2+dfsg-3",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.17.2+dfsg-3",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.17.2+dfsg-3",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2021-20251",
"aliases": [
"DEBIAN-CVE-2021-20251"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.17.2+dfsg-3"
}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:deb/debian/samba?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-20251.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.17.2+dfsg-3"
}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:deb/debian/samba?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-20251.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.17.2+dfsg-3"
}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:deb/debian/samba?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-20251.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T18:03:58.895321239Z",
"provider": "osv",
"upstream": [
"CVE-2021-20251"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2021-20251"
]
},
"related_cves": [
{
"value": "CVE-2021-20251",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 422823,
"published_at": "2023-03-06T23:15:10.387+00:00"
}