CVE-2024-21977 (GCVE-0-2024-21977)
Vulnerability from cvelistv5 – Published: 2025-09-05 12:58 – Updated: 2025-09-05 13:35
VLAI
EPSS
VEX
Summary
Incomplete cleanup after loading a CPU microcode patch may allow a privileged attacker to degrade the entropy of the RDRAND instruction, potentially resulting in loss of integrity for SEV-SNP guests.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-05 13:34 UTC
CWE
- CWE-459 - Incomplete Cleanup
Assigner
References
Impacted products
20 products
Date Public
2025-09-05 12:37
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{
"status": "unaffected",
"version": "EmbeddedAM5PI 1.0.0.3"
}
]
},
{
"defaultStatus": "affected",
"product": "AMD Ryzen\u2122 Embedded 5000 Series Processors",
"vendor": "AMD",
"versions": [
{
"status": "unaffected",
"version": "EmbAM4PI 1.0.0.7"
}
]
},
{
"defaultStatus": "affected",
"product": "AMD Ryzen\u2122 Embedded V3000 Series Processors",
"vendor": "AMD",
"versions": [
{
"status": "unaffected",
"version": "Embedded-PI_FP7r2 100A"
}
]
}
],
"datePublic": "2025-09-05T12:37:57.776Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "Incomplete cleanup after loading a CPU microcode patch may allow a privileged attacker to degrade the entropy of the RDRAND instruction, potentially resulting in loss of integrity for SEV-SNP guests.\u003cbr\u003e"
}
],
"value": "Incomplete cleanup after loading a CPU microcode patch may allow a privileged attacker to degrade the entropy of the RDRAND instruction, potentially resulting in loss of integrity for SEV-SNP guests."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 3.2,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "HIGH",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:N",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-459",
"description": "CWE-459 Incomplete Cleanup",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-09-05T12:58:39.312Z",
"orgId": "b58fc414-a1e4-4f92-9d70-1add41838648",
"shortName": "AMD"
},
"references": [
{
"url": "https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-4012.html"
},
{
"url": "https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-5007.html"
},
{
"url": "https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3014.html"
}
],
"source": {
"discovery": "UNKNOWN"
},
"x_generator": {
"engine": "AMD PSIRT Automation 1.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "b58fc414-a1e4-4f92-9d70-1add41838648",
"assignerShortName": "AMD",
"cveId": "CVE-2024-21977",
"datePublished": "2025-09-05T12:58:39.312Z",
"dateReserved": "2024-01-03T16:43:30.196Z",
"dateUpdated": "2025-09-05T13:35:08.152Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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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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