CVE-2021-42385 (GCVE-0-2021-42385)
Vulnerability from cvelistv5 – Published: 2021-11-15 00:00 – Updated: 2025-11-03 20:34
VLAI
EPSS
VEX
Summary
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 evaluate function
Severity
7.2 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 13:32 UTC
CWE
Assigner
References
6 references
Impacted products
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},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQXGOGWBIYWOIVXJVRKHZR34UMEHQBXS/\", \"name\": \"FEDORA-2021-5a95823596\", \"tags\": [\"vendor-advisory\", \"x_transferred\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAIQGP7WCPGV/\", \"name\": \"FEDORA-2021-c52c0fe490\", \"tags\": [\"vendor-advisory\", \"x_transferred\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20211223-0002/\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2025/01/msg00012.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T20:34:13.955Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.2, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"HIGH\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-42385\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-04-23T13:32:00.554083Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-04-23T15:24:20.231Z\"}}], \"cna\": {\"affected\": [{\"vendor\": \"busybox\", \"product\": \"busybox\", \"versions\": [{\"status\": \"affected\", \"version\": \"unspecified\", \"lessThan\": \"1.34.0\", \"versionType\": \"custom\"}]}], \"references\": [{\"url\": \"https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQXGOGWBIYWOIVXJVRKHZR34UMEHQBXS/\", \"name\": \"FEDORA-2021-5a95823596\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAIQGP7WCPGV/\", \"name\": \"FEDORA-2021-c52c0fe490\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20211223-0002/\"}, {\"url\": \"https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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 evaluate function\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416\"}]}], \"providerMetadata\": {\"orgId\": \"48a46f29-ae42-4e1d-90dd-c1676c1e5e6d\", \"shortName\": \"JFROG\", \"dateUpdated\": \"2023-04-25T00:00:00.000Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2021-42385\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T20:34:13.955Z\", \"dateReserved\": \"2021-10-14T00:00:00.000Z\", \"assignerOrgId\": \"48a46f29-ae42-4e1d-90dd-c1676c1e5e6d\", \"datePublished\": \"2021-11-15T00:00:00.000Z\", \"assignerShortName\": \"JFROG\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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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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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