FKIE_CVE-2021-20203
Vulnerability from fkie_nvd - Published: 2021-02-25 20:15 - Updated: 2026-06-17 03:33
Severity
Summary
An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU for versions up to v5.2.0. It may occur if a guest was to supply invalid values for rx/tx queue size or other NIC parameters. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| qemu | qemu | * | |
| fedoraproject | fedora | 33 | |
| debian | debian_linux | 9.0 | |
| debian | debian_linux | 10.0 |
{
"affected": [
{
"affectedData": [
{
"product": "qemu",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "versions up to v5.2.0"
}
]
}
],
"source": "secalert@redhat.com"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*",
"matchCriteriaId": "326C44E5-259C-47D1-B540-E153CD7C907C",
"versionEndIncluding": "5.2.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
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"vulnerable": true
}
],
"negate": false,
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}
]
},
{
"nodes": [
{
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"matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
"matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73",
"vulnerable": true
}
],
"negate": false,
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}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU for versions up to v5.2.0. It may occur if a guest was to supply invalid values for rx/tx queue size or other NIC parameters. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario."
},
{
"lang": "es",
"value": "Se encontr\u00f3 un problema de desbordamiento de enteros en el emulador de NIC vmxnet3 de QEMU para versiones hasta v5.2.0.\u0026#xa0;Puede ocurrir si un invitado estaba suministrando valores no v\u00e1lidos para el tama\u00f1o de la cola rx/tx u otros par\u00e1metros de NIC.\u0026#xa0;Un usuario invitado privilegiado puede usar este fallo para bloquear el proceso QEMU en el host, resultando en un escenario de DoS"
}
],
"id": "CVE-2021-20203",
"lastModified": "2026-06-17T03:33:27.903",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "LOW",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "LOCAL",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 2.1,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:P",
"version": "2.0"
},
"exploitabilityScore": 3.9,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "LOW",
"baseScore": 3.2,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "HIGH",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L",
"version": "3.1"
},
"exploitabilityScore": 1.5,
"impactScore": 1.4,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2021-02-25T20:15:11.597",
"references": [
{
"source": "secalert@redhat.com",
"tags": [
"Exploit",
"Patch",
"Third Party Advisory"
],
"url": "https://bugs.launchpad.net/qemu/+bug/1913873"
},
{
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},
{
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"tags": [
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"url": "https://lists.debian.org/debian-lts-announce/2021/04/msg00009.html"
},
{
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},
{
"source": "secalert@redhat.com",
"tags": [
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],
"url": "https://security.gentoo.org/glsa/202208-27"
},
{
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"tags": [
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],
"url": "https://bugs.launchpad.net/qemu/+bug/1913873"
},
{
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"tags": [
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1922441"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "https://lists.debian.org/debian-lts-announce/2021/04/msg00009.html"
},
{
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},
{
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"tags": [
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],
"url": "https://security.gentoo.org/glsa/202208-27"
}
],
"sourceIdentifier": "secalert@redhat.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-190"
}
],
"source": "secalert@redhat.com",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-190"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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- 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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