MediumFix available
logback — security advisory
In logback version 1.2.7 and prior versions, an attacker with the required privileges to edit configurations files could craft a malicious configuration allowing to execute arbitrary code loaded from LDAP servers.
- Products
- logback
- Affected versions
- Not specified
- Fixed versions
- 1:1.2.8-1
- CVEs
- CVE-2021-42550
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 00:51 UTC · Revision 1
Source evidence
In logback version 1.2.7 and prior versions, an attacker with the required privileges to edit configurations files could craft a malicious configuration allowing to execute arbitrary code loaded from LDAP servers.
osv:DEBIAN-CVE-2021-42550
logback
Fixed versions: 1:1.2.8-1
logback
Fixed versions: 1:1.2.8-1
logback
Fixed versions: 1:1.2.8-1
Complete source record
{
"id": "5847bc22d629844daedec736172dccc71585405547d09ad642533b1457603379",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2021-42550",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2021-42550",
"summary": "In logback version 1.2.7 and prior versions, an attacker with the required privileges to edit configurations files could craft a malicious configuration allowing to execute arbitrary code loaded from LDAP servers.",
"evidence": "osv:DEBIAN-CVE-2021-42550",
"products": [
{
"name": {
"value": "logback",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:1.2.8-1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "logback",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:1.2.8-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "logback",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:1.2.8-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2021-42550",
"aliases": [
"DEBIAN-CVE-2021-42550"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:1.2.8-1"
}
]
}
],
"package": {
"name": "logback",
"purl": "pkg:deb/debian/logback?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-42550.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:1.2.8-1"
}
]
}
],
"package": {
"name": "logback",
"purl": "pkg:deb/debian/logback?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-42550.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:1.2.8-1"
}
]
}
],
"package": {
"name": "logback",
"purl": "pkg:deb/debian/logback?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-42550.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T18:03:50.933225240Z",
"provider": "osv",
"upstream": [
"CVE-2021-42550"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2021-42550"
]
},
"related_cves": [
{
"value": "CVE-2021-42550",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 422454,
"published_at": "2021-12-16T19:15:08.297+00:00"
}