How severe is CVE-2024-21977?

CVE-2024-21977 has a CVSS 3.x base score of 3.2, rated low severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2024-21977 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2024-21977?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-21977 have an EU (EUVD) identifier?

Yes. CVE-2024-21977 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19583.

When was CVE-2024-21977 published?

CVE-2024-21977 was published on 2025-09-05 and last updated on 2026-06-17.

CVE-2024-21977

CVE-2024-21977 is a low-severity vulnerability with a CVSS 3.x base score of 3.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-459.

Key facts

Severity: Low (CVSS 3.x base score 3.2)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-19583
Weakness: CWE-459
Published: 2025-09-05
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2024-21977?: 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.
How severe is CVE-2024-21977?: CVE-2024-21977 has a CVSS 3.x base score of 3.2, rated low severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2024-21977 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2024-21977?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-21977 have an EU (EUVD) identifier?: Yes. CVE-2024-21977 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19583.
When was CVE-2024-21977 published?: CVE-2024-21977 was published on 2025-09-05 and last updated on 2026-06-17.

References

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