CVE-2021-20257 (GCVE-0-2021-20257)
Vulnerability from cvelistv5 – Published: 2022-03-16 14:12 – Updated: 2024-08-03 17:37
VLAI
EPSS
VEX
Summary
An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid values. This flaw allows a guest to consume CPU cycles on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Severity
6.5 (Medium)
CWE
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://www.openwall.com/lists/oss-security/2021/… | x_refsource_MISC |
| https://lists.gnu.org/archive/html/qemu-devel/202… | x_refsource_MISC |
| https://github.com/qemu/qemu/commit/3de46e6fc489c… | x_refsource_MISC |
| https://bugzilla.redhat.com/show_bug.cgi?id=1930087 | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2022042… | x_refsource_CONFIRM |
| https://security.gentoo.org/glsa/202208-27 | vendor-advisoryx_refsource_GENTOO |
| https://lists.debian.org/debian-lts-announce/2022… | mailing-listx_refsource_MLIST |
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"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.0,
"impactScore": 4.0,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2022-03-16T15:15:09.983",
"references": [
{
"source": "secalert@redhat.com",
"tags": [
"Issue Tracking",
"Patch",
"Third Party Advisory"
],
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1930087"
},
{
"source": "secalert@redhat.com",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://github.com/qemu/qemu/commit/3de46e6fc489c52c9431a8a832ad8170a7569bd8"
},
{
"source": "secalert@redhat.com",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html"
},
{
"source": "secalert@redhat.com",
"tags": [
"Mailing List",
"Patch",
"Vendor Advisory"
],
"url": "https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg07428.html"
},
{
"source": "secalert@redhat.com",
"tags": [
"Third Party Advisory"
],
"url": "https://security.gentoo.org/glsa/202208-27"
},
{
"source": "secalert@redhat.com",
"tags": [
"Third Party Advisory"
],
"url": "https://security.netapp.com/advisory/ntap-20220425-0003/"
},
{
"source": "secalert@redhat.com",
"tags": [
"Mailing List",
"Patch",
"Third Party Advisory"
],
"url": "https://www.openwall.com/lists/oss-security/2021/02/25/2"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Issue Tracking",
"Patch",
"Third Party Advisory"
],
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1930087"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://github.com/qemu/qemu/commit/3de46e6fc489c52c9431a8a832ad8170a7569bd8"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Patch",
"Vendor Advisory"
],
"url": "https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg07428.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://security.gentoo.org/glsa/202208-27"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://security.netapp.com/advisory/ntap-20220425-0003/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Patch",
"Third Party Advisory"
],
"url": "https://www.openwall.com/lists/oss-security/2021/02/25/2"
}
],
"sourceIdentifier": "secalert@redhat.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-835"
}
],
"source": "secalert@redhat.com",
"type": "Primary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-835"
}
],
"source": "nvd@nist.gov",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-06-28T07:42:38+00:00",
"cve": "CVE-2021-20257",
"id": "CVE-2021-20257",
"initial_release_date": "2021-02-10T00:00:00+00:00",
"product_status:fixed": "1786",
"product_status:known_affected": "81",
"product_status:known_not_affected": "5",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "QEMU: net: e1000: infinite loop while processing transmit descriptors",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-20257.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "low",
"current_release_date": "2026-09-01T01:40:33Z",
"cve": "CVE-2021-20257",
"id": "CVE-2021-20257",
"initial_release_date": "2023-02-15T03:47:19Z",
"product_status:known_affected": "388",
"product_status:known_not_affected": "828",
"product_status:recommended": "2082",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2021-20257",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-20257.json",
"version": "43"
}
}
}
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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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