CVE-2024-21977

LOWNVD 3.23.2—

3.2

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.

CVSS v3: 3.2
EG Score: 3.2(medium)
EPSS: 7.2%
KEV: Not listed

Published

September 5, 2025

Last Modified

April 15, 2026

References (3)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-459Incomplete Cleanup

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:12 UTCepss_batch
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2026-06-01 13:51 UTCepss_batch
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2026-05-29 13:43 UTCepss_batch
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Frequently asked(5)

What is CVE-2024-21977?

CVE-2024-21977 is a low vulnerability published on September 5, 2025. 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.

When was CVE-2024-21977 disclosed?

CVE-2024-21977 was first published in the National Vulnerability Database on September 5, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2024-21977 actively exploited?

CVE-2024-21977 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2024-21977?

CVE-2024-21977 has a CVSS v3 base score of 3.2 (NVD).

How do I remediate CVE-2024-21977?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-21977, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2024-21977

📅 Published

🔄 Last Modified

🔗 References (3)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2024-21977?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (3)

Frequently asked(5)

Related CVEs(same CWE)