How severe is CVE-2023-20566?

CVE-2023-20566 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over local access with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2023-20566 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-20566?

CVE-2023-20566 primarily affects Amd Epyc 7763 Firmware. In total, 65 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-20566?

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

When was CVE-2023-20566 published?

CVE-2023-20566 was published on 2023-11-14 and last updated on 2026-06-17.

CVE-2023-20566

CVE-2023-20566 is a medium-severity vulnerability in Amd Epyc 7763 Firmware with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Amd Epyc 7763 Firmware
Published: 2023-11-14
Last modified: 2026-06-17

Description

Improper address validation in ASP with SNP enabled may potentially allow an attacker to compromise guest memory integrity.

Frequently asked questions

What is CVE-2023-20566?: Improper address validation in ASP with SNP enabled may potentially allow an attacker to compromise guest memory integrity.
How severe is CVE-2023-20566?: CVE-2023-20566 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over local access with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2023-20566 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-20566?: CVE-2023-20566 primarily affects Amd Epyc 7763 Firmware. In total, 65 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-20566?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-20566 published?: CVE-2023-20566 was published on 2023-11-14 and last updated on 2026-06-17.

References

https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3002

Affected products (65)

cpe:2.3:o:amd:epyc_7763_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7713p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7713_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7663p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7663_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7643p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7773x_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7643_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7573x_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_75f3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7543p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7543_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7513_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7473x_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7453_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_74f3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7443p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7443_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7413_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7373x_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_73f3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7343_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7313p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7313_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7303p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7303_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_72f3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7203p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7203_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9654p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9654_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9634_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9554p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9554_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9534_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9474f_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9454p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9454_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9374f_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9354p_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Amd Epyc 7763 Firmware

CVE-2023-20520 — Critical (CVSS 9.8): Improper access control settings in ASP Bootloader may allow an attacker to corrupt the return address causing…
CVE-2021-26379 — Critical (CVSS 9.8): Insufficient input validation of mailbox data in the SMU may allow an attacker to coerce the SMU to corrupt SMRAM,…
CVE-2021-46756 — Critical (CVSS 9.1): Insufficient validation of inputs in SVC_MAP_USER_STACK in the ASP (AMD Secure Processor) bootloader may allow…
CVE-2021-46769 — High (CVSS 8.8): Insufficient syscall input validation in the ASP Bootloader may allow a privileged attacker to execute arbitrary DMA…
CVE-2021-26340 — High (CVSS 8.4): A malicious hypervisor in conjunction with an unprivileged attacker process inside an SEV/SEV-ES guest VM may fail to…
CVE-2024-21980 — High (CVSS 7.9): Improper restriction of write operations in SNP firmware could allow a malicious hypervisor to potentially overwrite a…

All CVEs affecting Amd Epyc 7763 Firmware →