How severe is CVE-2021-26311?

CVE-2021-26311 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-26311 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26311?

CVE-2021-26311 primarily affects Amd Epyc 7232p. In total, 65 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-26311?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-26311 published?

CVE-2021-26311 was published on 2021-05-13 and last updated on 2026-06-17.

CVE-2021-26311

CVE-2021-26311 is a high-severity vulnerability in Amd Epyc 7232p with a CVSS 3.x base score of 7.2. 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-77.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 9.0
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-77
Affected product: Amd Epyc 7232p
Published: 2021-05-13
Last modified: 2026-06-17

Description

In the AMD SEV/SEV-ES feature, memory can be rearranged in the guest address space that is not detected by the attestation mechanism which could be used by a malicious hypervisor to potentially lead to arbitrary code execution within the guest VM if a malicious administrator has access to compromise the server hypervisor.

Frequently asked questions

What is CVE-2021-26311?: In the AMD SEV/SEV-ES feature, memory can be rearranged in the guest address space that is not detected by the attestation mechanism which could be used by a malicious hypervisor to potentially lead to arbitrary code execution within the guest VM if a malicious administrator has access to compromise the server hypervisor.
How severe is CVE-2021-26311?: CVE-2021-26311 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-26311 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26311?: CVE-2021-26311 primarily affects Amd Epyc 7232p. In total, 65 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-26311?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-26311 published?: CVE-2021-26311 was published on 2021-05-13 and last updated on 2026-06-17.

References

https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1004

Affected products (65)

cpe:2.3:h:amd:epyc_7232p:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7251:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7252:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7261:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7262:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7272:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7281:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7282:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_72f3:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7301:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7302:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7302p:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7313:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7313p:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7343:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7351:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7351p:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7352:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7371:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_73f3:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7401:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7401p:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7402:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7402p:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7413:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7443:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7443p:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7451:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7452:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7453:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_74f3:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7501:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7502:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7502p:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7513:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7532:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7542:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7543:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7543p:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7551:-:*:*:*:*:*:*:*

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