ubuntu-cve-2021-20277
Vulnerability from osv_ubuntu
Published
2021-03-24 00:00
Modified
2026-04-22 07:39
Summary
Details
A flaw was found in Samba's libldb. Multiple, consecutive leading spaces in an LDAP attribute can lead to an out-of-bounds memory write, leading to a crash of the LDAP server process handling the request. The highest threat from this vulnerability is to system availability.
Severity
7.1 (High)
7.5 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "ldb-tools",
"binary_version": "1:1.1.24-0ubuntu0.14.04.2+esm1"
},
{
"binary_name": "libldb1",
"binary_version": "1:1.1.24-0ubuntu0.14.04.2+esm1"
},
{
"binary_name": "python-ldb",
"binary_version": "1:1.1.24-0ubuntu0.14.04.2+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "ldb",
"purl": "pkg:deb/ubuntu/ldb@1:1.1.24-0ubuntu0.14.04.2+esm1?arch=source\u0026distro=trusty/esm"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:1.1.24-0ubuntu0.14.04.2+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:1.1.15-1.1",
"1:1.1.16-1",
"1:1.1.16-1ubuntu0.1",
"1:1.1.24-0ubuntu0.14.04.1",
"1:1.1.24-0ubuntu0.14.04.2"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "ldb-tools",
"binary_version": "2:1.1.24-1ubuntu3.2"
},
{
"binary_name": "libldb1",
"binary_version": "2:1.1.24-1ubuntu3.2"
},
{
"binary_name": "python-ldb",
"binary_version": "2:1.1.24-1ubuntu3.2"
},
{
"binary_name": "python3-ldb",
"binary_version": "2:1.1.24-1ubuntu3.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "ldb",
"purl": "pkg:deb/ubuntu/ldb@2:1.1.24-1ubuntu3.2?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.1.24-1ubuntu3.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:1.1.20-2",
"2:1.1.21-1",
"2:1.1.23-1",
"2:1.1.23-1ubuntu1",
"2:1.1.24-1ubuntu1",
"2:1.1.24-1ubuntu3",
"2:1.1.24-1ubuntu3.1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "ldb-tools",
"binary_version": "2:1.2.3-1ubuntu0.2"
},
{
"binary_name": "libldb1",
"binary_version": "2:1.2.3-1ubuntu0.2"
},
{
"binary_name": "python-ldb",
"binary_version": "2:1.2.3-1ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "ldb",
"purl": "pkg:deb/ubuntu/ldb@2:1.2.3-1ubuntu0.2?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.2.3-1ubuntu0.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:1.1.29-2",
"2:1.2.2-2",
"2:1.2.3-1",
"2:1.2.3-1ubuntu0.1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "ldb-tools",
"binary_version": "2:2.0.10-0ubuntu0.20.04.3"
},
{
"binary_name": "libldb2",
"binary_version": "2:2.0.10-0ubuntu0.20.04.3"
},
{
"binary_name": "python3-ldb",
"binary_version": "2:2.0.10-0ubuntu0.20.04.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "ldb",
"purl": "pkg:deb/ubuntu/ldb@2:2.0.10-0ubuntu0.20.04.3?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:2.0.10-0ubuntu0.20.04.3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:1.5.5-0ubuntu2",
"2:1.5.5-0ubuntu3",
"2:2.0.7-4",
"2:2.0.8-1ubuntu1",
"2:2.0.8-2",
"2:2.0.10-0ubuntu0.20.04.1",
"2:2.0.10-0ubuntu0.20.04.2"
]
}
],
"aliases": [],
"details": "A flaw was found in Samba\u0027s libldb. Multiple, consecutive leading spaces in an LDAP attribute can lead to an out-of-bounds memory write, leading to a crash of the LDAP server process handling the request. The highest threat from this vulnerability is to system availability.",
"id": "UBUNTU-CVE-2021-20277",
"modified": "2026-04-22T07:39:53Z",
"published": "2021-03-24T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-20277"
},
{
"type": "REPORT",
"url": "https://www.samba.org/samba/security/CVE-2021-20277.html"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-4888-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-4888-2"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-20277"
}
],
"related": [
"USN-4888-1",
"USN-4888-2"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "high",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2021-20277"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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