How severe is CVE-2023-20578?

CVE-2023-20578 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over local access with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-20578 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-20578?

CVE-2023-20578 primarily affects Amd Epyc 8024pn Firmware. In total, 105 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-20578?

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.

Does CVE-2023-20578 have an EU (EUVD) identifier?

Yes. CVE-2023-20578 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-24757.

When was CVE-2023-20578 published?

CVE-2023-20578 was published on 2024-08-13 and last updated on 2026-06-17.

CVE-2023-20578

CVE-2023-20578 is a high-severity vulnerability in Amd Epyc 8024pn Firmware with a CVSS 3.x base score of 7.5. 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-367.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-24757
Weakness: CWE-367
Affected product: Amd Epyc 8024pn Firmware
Published: 2024-08-13
Last modified: 2026-06-17

Description

A TOCTOU (Time-Of-Check-Time-Of-Use) in SMM may allow an attacker with ring0 privileges and access to the BIOS menu or UEFI shell to modify the communications buffer potentially resulting in arbitrary code execution.

Frequently asked questions

What is CVE-2023-20578?: A TOCTOU (Time-Of-Check-Time-Of-Use) in SMM may allow an attacker with ring0 privileges and access to the BIOS menu or UEFI shell to modify the communications buffer potentially resulting in arbitrary code execution.
How severe is CVE-2023-20578?: CVE-2023-20578 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over local access with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-20578 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-20578?: CVE-2023-20578 primarily affects Amd Epyc 8024pn Firmware. In total, 105 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-20578?: 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.
Does CVE-2023-20578 have an EU (EUVD) identifier?: Yes. CVE-2023-20578 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-24757.
When was CVE-2023-20578 published?: CVE-2023-20578 was published on 2024-08-13 and last updated on 2026-06-17.

References

https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3003.html

Affected products (105)

cpe:2.3:o:amd:epyc_8024pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8024p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8124pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8124p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8224pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8224p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8324pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8324p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8434pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8434p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8534pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8534p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9734_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9754s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9754_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9184x_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9384x_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9684x_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9124_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9174f_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9224_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9254_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9274f_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9334_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9354_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9354p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9374f_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9454_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9454p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9474f_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9534_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9554_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9554p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9634_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9654_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_9654p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7203_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7203p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_72f3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7303_firmware:*:*:*:*:*:*:*:*

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