ubuntu-cve-2021-42380
Vulnerability from osv_ubuntu
Published
2021-11-15 21:15
Modified
2025-09-08 16:47
Summary
Details
A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the clrvar function
Severity
7.2 (High)
7.2 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "busybox",
"binary_version": "1:1.21.0-1ubuntu1.4+esm1"
},
{
"binary_name": "busybox-initramfs",
"binary_version": "1:1.21.0-1ubuntu1.4+esm1"
},
{
"binary_name": "busybox-static",
"binary_version": "1:1.21.0-1ubuntu1.4+esm1"
},
{
"binary_name": "busybox-syslogd",
"binary_version": "1:1.21.0-1ubuntu1.4+esm1"
},
{
"binary_name": "udhcpc",
"binary_version": "1:1.21.0-1ubuntu1.4+esm1"
},
{
"binary_name": "udhcpd",
"binary_version": "1:1.21.0-1ubuntu1.4+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "busybox",
"purl": "pkg:deb/ubuntu/busybox@1:1.21.0-1ubuntu1.4+esm1?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:1.20.0-8.1ubuntu1",
"1:1.20.0-9ubuntu1",
"1:1.20.0-9ubuntu2",
"1:1.21.0-1ubuntu1",
"1:1.21.0-1ubuntu1.4",
"1:1.21.0-1ubuntu1.4+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "busybox",
"binary_version": "1:1.22.0-15ubuntu1.4+esm2"
},
{
"binary_name": "busybox-initramfs",
"binary_version": "1:1.22.0-15ubuntu1.4+esm2"
},
{
"binary_name": "busybox-static",
"binary_version": "1:1.22.0-15ubuntu1.4+esm2"
},
{
"binary_name": "busybox-syslogd",
"binary_version": "1:1.22.0-15ubuntu1.4+esm2"
},
{
"binary_name": "udhcpc",
"binary_version": "1:1.22.0-15ubuntu1.4+esm2"
},
{
"binary_name": "udhcpd",
"binary_version": "1:1.22.0-15ubuntu1.4+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "busybox",
"purl": "pkg:deb/ubuntu/busybox@1:1.22.0-15ubuntu1.4+esm2?arch=source\u0026distro=esm-infra/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:1.22.0-15ubuntu1",
"1:1.22.0-15ubuntu1.4",
"1:1.22.0-15ubuntu1.4+esm1",
"1:1.22.0-15ubuntu1.4+esm2"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "busybox",
"binary_version": "1:1.27.2-2ubuntu3.4"
},
{
"binary_name": "busybox-initramfs",
"binary_version": "1:1.27.2-2ubuntu3.4"
},
{
"binary_name": "busybox-static",
"binary_version": "1:1.27.2-2ubuntu3.4"
},
{
"binary_name": "busybox-syslogd",
"binary_version": "1:1.27.2-2ubuntu3.4"
},
{
"binary_name": "udhcpc",
"binary_version": "1:1.27.2-2ubuntu3.4"
},
{
"binary_name": "udhcpd",
"binary_version": "1:1.27.2-2ubuntu3.4"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "busybox",
"purl": "pkg:deb/ubuntu/busybox@1:1.27.2-2ubuntu3.4?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:1.27.2-2ubuntu3.4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:1.22.0-19ubuntu2",
"1:1.27.2-1ubuntu3",
"1:1.27.2-1ubuntu4",
"1:1.27.2-2ubuntu2",
"1:1.27.2-2ubuntu3",
"1:1.27.2-2ubuntu3.1",
"1:1.27.2-2ubuntu3.2",
"1:1.27.2-2ubuntu3.3"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "busybox",
"binary_version": "1:1.30.1-4ubuntu6.4"
},
{
"binary_name": "busybox-initramfs",
"binary_version": "1:1.30.1-4ubuntu6.4"
},
{
"binary_name": "busybox-static",
"binary_version": "1:1.30.1-4ubuntu6.4"
},
{
"binary_name": "busybox-syslogd",
"binary_version": "1:1.30.1-4ubuntu6.4"
},
{
"binary_name": "udhcpc",
"binary_version": "1:1.30.1-4ubuntu6.4"
},
{
"binary_name": "udhcpd",
"binary_version": "1:1.30.1-4ubuntu6.4"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "busybox",
"purl": "pkg:deb/ubuntu/busybox@1:1.30.1-4ubuntu6.4?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:1.30.1-4ubuntu6.4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:1.30.1-4ubuntu4",
"1:1.30.1-4ubuntu5",
"1:1.30.1-4ubuntu6",
"1:1.30.1-4ubuntu6.1",
"1:1.30.1-4ubuntu6.2",
"1:1.30.1-4ubuntu6.3"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "busybox",
"binary_version": "1:1.30.1-7ubuntu2"
},
{
"binary_name": "busybox-initramfs",
"binary_version": "1:1.30.1-7ubuntu2"
},
{
"binary_name": "busybox-static",
"binary_version": "1:1.30.1-7ubuntu2"
},
{
"binary_name": "busybox-syslogd",
"binary_version": "1:1.30.1-7ubuntu2"
},
{
"binary_name": "udhcpc",
"binary_version": "1:1.30.1-7ubuntu2"
},
{
"binary_name": "udhcpd",
"binary_version": "1:1.30.1-7ubuntu2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "busybox",
"purl": "pkg:deb/ubuntu/busybox@1:1.30.1-7ubuntu2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:1.30.1-7ubuntu2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:1.30.1-6ubuntu3",
"1:1.30.1-7ubuntu1"
]
}
],
"aliases": [],
"details": "A use-after-free in Busybox\u0027s awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the clrvar function",
"id": "UBUNTU-CVE-2021-42380",
"modified": "2025-09-08T16:47:23Z",
"published": "2021-11-15T21:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-42380"
},
{
"type": "REPORT",
"url": "https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-5179-1"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-42380"
}
],
"related": [
"USN-5179-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2021-42380"
]
}
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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.
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- 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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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