MediumFix available
busybox — security advisory
An incorrect handling of a special element in Busybox's ash applet leads to denial of service when processing a crafted shell command, due to the shell mistaking specific characters for reserved characters. This may be used for DoS under rare conditions of filtered command input.
- Products
- busybox
- Affected versions
- Not specified
- Fixed versions
- 1:1.35.0-1
- CVEs
- CVE-2021-42375
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 02:02 UTC · Revision 1
Source evidence
An incorrect handling of a special element in Busybox's ash applet leads to denial of service when processing a crafted shell command, due to the shell mistaking specific characters for reserved characters. This may be used for DoS under rare conditions of filtered command input.
osv:DEBIAN-CVE-2021-42375
busybox
Fixed versions: 1:1.35.0-1
busybox
Fixed versions: 1:1.35.0-1
busybox
Fixed versions: 1:1.35.0-1
Complete source record
{
"id": "7be18a1e8bd914601fcef882c626304fd343e8d66f8db6e0f3dd9ead182dc8da",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2021-42375",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2021-42375",
"summary": "An incorrect handling of a special element in Busybox's ash applet leads to denial of service when processing a crafted shell command, due to the shell mistaking specific characters for reserved characters. This may be used for DoS under rare conditions of filtered command input.",
"evidence": "osv:DEBIAN-CVE-2021-42375",
"products": [
{
"name": {
"value": "busybox",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:1.35.0-1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "busybox",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:1.35.0-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "busybox",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:1.35.0-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2021-42375",
"aliases": [
"DEBIAN-CVE-2021-42375"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:1.35.0-1"
}
]
}
],
"package": {
"name": "busybox",
"purl": "pkg:deb/debian/busybox?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-42375.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:1.35.0-1"
}
]
}
],
"package": {
"name": "busybox",
"purl": "pkg:deb/debian/busybox?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-42375.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:1.35.0-1"
}
]
}
],
"package": {
"name": "busybox",
"purl": "pkg:deb/debian/busybox?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-42375.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
}
],
"modified": "2026-10-23T18:05:23.198616923Z",
"provider": "osv",
"upstream": [
"CVE-2021-42375"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2021-42375"
]
},
"related_cves": [
{
"value": "CVE-2021-42375",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 424391,
"published_at": "2021-11-15T21:15:07.593+00:00"
}