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.

Published: 2024-08-13 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-20578 is rated Low Risk (35.5/100): CVSS High severity, with low exploitation likelihood (EPSS 0.05%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-20578

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 0.04% 0.05% +0.01%
2 2025-11-18 0.05% 0.04% -0.01%
3 2025-09-21 — 0.05% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-20578

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 0.8 6.0 [email protected]
6.4 3.1 MEDIUM
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 0.5 5.9 [email protected]

Weakness enumeration for CVE-2023-20578

Affected software / configurations for CVE-2023-20578

Vendor Product Version Raw CPE
amd epyc_8024pn_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_8024pn_firmware:*:*:*:*:*:*:*:*
amd epyc_8024p_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_8024p_firmware:*:*:*:*:*:*:*:*
amd epyc_8124pn_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_8124pn_firmware:*:*:*:*:*:*:*:*
amd epyc_8124p_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_8124p_firmware:*:*:*:*:*:*:*:*
amd epyc_8224pn_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_8224pn_firmware:*:*:*:*:*:*:*:*
amd epyc_8224p_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_8224p_firmware:*:*:*:*:*:*:*:*
amd epyc_8324pn_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_8324pn_firmware:*:*:*:*:*:*:*:*
amd epyc_8324p_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_8324p_firmware:*:*:*:*:*:*:*:*
amd epyc_8434pn_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_8434pn_firmware:*:*:*:*:*:*:*:*
amd epyc_8434p_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_8434p_firmware:*:*:*:*:*:*:*:*
amd epyc_8534pn_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_8534pn_firmware:*:*:*:*:*:*:*:*
amd epyc_8534p_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_8534p_firmware:*:*:*:*:*:*:*:*
amd epyc_9734_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9734_firmware:*:*:*:*:*:*:*:*
amd epyc_9754s_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9754s_firmware:*:*:*:*:*:*:*:*
amd epyc_9754_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9754_firmware:*:*:*:*:*:*:*:*
amd epyc_9184x_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9184x_firmware:*:*:*:*:*:*:*:*
amd epyc_9384x_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9384x_firmware:*:*:*:*:*:*:*:*
amd epyc_9684x_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9684x_firmware:*:*:*:*:*:*:*:*
amd epyc_9124_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9124_firmware:*:*:*:*:*:*:*:*
amd epyc_9174f_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9174f_firmware:*:*:*:*:*:*:*:*
amd epyc_9224_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9224_firmware:*:*:*:*:*:*:*:*
amd epyc_9254_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9254_firmware:*:*:*:*:*:*:*:*
amd epyc_9274f_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9274f_firmware:*:*:*:*:*:*:*:*
amd epyc_9334_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9334_firmware:*:*:*:*:*:*:*:*
amd epyc_9354_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9354_firmware:*:*:*:*:*:*:*:*
amd epyc_9354p_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9354p_firmware:*:*:*:*:*:*:*:*
amd epyc_9374f_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9374f_firmware:*:*:*:*:*:*:*:*
amd epyc_9454_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9454_firmware:*:*:*:*:*:*:*:*
amd epyc_9454p_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9454p_firmware:*:*:*:*:*:*:*:*
amd epyc_9474f_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9474f_firmware:*:*:*:*:*:*:*:*
amd epyc_9534_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9534_firmware:*:*:*:*:*:*:*:*
amd epyc_9554_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9554_firmware:*:*:*:*:*:*:*:*
amd epyc_9554p_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9554p_firmware:*:*:*:*:*:*:*:*
amd epyc_9634_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9634_firmware:*:*:*:*:*:*:*:*
amd epyc_9654_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9654_firmware:*:*:*:*:*:*:*:*
amd epyc_9654p_firmware < genoapi_1.0.0.2 cpe:2.3:o:amd:epyc_9654p_firmware:*:*:*:*:*:*:*:*
amd epyc_7203_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7203_firmware:*:*:*:*:*:*:*:*
amd epyc_7203p_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7203p_firmware:*:*:*:*:*:*:*:*
amd epyc_72f3_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_72f3_firmware:*:*:*:*:*:*:*:*
amd epyc_7303_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7303_firmware:*:*:*:*:*:*:*:*
amd epyc_7303p_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7303p_firmware:*:*:*:*:*:*:*:*
amd epyc_7313_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7313_firmware:*:*:*:*:*:*:*:*
amd epyc_7313p_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7313p_firmware:*:*:*:*:*:*:*:*
amd epyc_7343_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7343_firmware:*:*:*:*:*:*:*:*
amd epyc_73f3_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_73f3_firmware:*:*:*:*:*:*:*:*
amd epyc_7373x_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7373x_firmware:*:*:*:*:*:*:*:*
amd epyc_7413_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7413_firmware:*:*:*:*:*:*:*:*
amd epyc_7443_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7443_firmware:*:*:*:*:*:*:*:*
amd epyc_7443p_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7443p_firmware:*:*:*:*:*:*:*:*
amd epyc_74f3_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_74f3_firmware:*:*:*:*:*:*:*:*
amd epyc_7453_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7453_firmware:*:*:*:*:*:*:*:*
amd epyc_7473x_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7473x_firmware:*:*:*:*:*:*:*:*
amd epyc_7513_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7513_firmware:*:*:*:*:*:*:*:*
amd epyc_7543_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7543_firmware:*:*:*:*:*:*:*:*
amd epyc_7543p_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7543p_firmware:*:*:*:*:*:*:*:*
amd epyc_75f3_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_75f3_firmware:*:*:*:*:*:*:*:*
amd epyc_7573x_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7573x_firmware:*:*:*:*:*:*:*:*
amd epyc_7643_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7643_firmware:*:*:*:*:*:*:*:*
amd epyc_7773x_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7773x_firmware:*:*:*:*:*:*:*:*
amd epyc_7643p_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7643p_firmware:*:*:*:*:*:*:*:*
amd epyc_7663_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7663_firmware:*:*:*:*:*:*:*:*
amd epyc_7663p_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7663p_firmware:*:*:*:*:*:*:*:*
amd epyc_7713_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7713_firmware:*:*:*:*:*:*:*:*
amd epyc_7713p_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7713p_firmware:*:*:*:*:*:*:*:*
amd epyc_7763_firmware < milanpi_1.0.0.5 cpe:2.3:o:amd:epyc_7763_firmware:*:*:*:*:*:*:*:*
amd epyc_7h12_firmware < romepi_1.0.0.g cpe:2.3:o:amd:epyc_7h12_firmware:*:*:*:*:*:*:*:*
amd epyc_7f72_firmware < romepi_1.0.0.g cpe:2.3:o:amd:epyc_7f72_firmware:*:*:*:*:*:*:*:*
amd epyc_7f52_firmware < romepi_1.0.0.g cpe:2.3:o:amd:epyc_7f52_firmware:*:*:*:*:*:*:*:*
amd epyc_7f32_firmware < romepi_1.0.0.g cpe:2.3:o:amd:epyc_7f32_firmware:*:*:*:*:*:*:*:*
amd epyc_7742_firmware < romepi_1.0.0.g cpe:2.3:o:amd:epyc_7742_firmware:*:*:*:*:*:*:*:*
amd epyc_7702p_firmware < romepi_1.0.0.g cpe:2.3:o:amd:epyc_7702p_firmware:*:*:*:*:*:*:*:*
amd epyc_7702_firmware < romepi_1.0.0.g cpe:2.3:o:amd:epyc_7702_firmware:*:*:*:*:*:*:*:*
amd epyc_7662_firmware < romepi_1.0.0.g cpe:2.3:o:amd:epyc_7662_firmware:*:*:*:*:*:*:*:*
amd epyc_7642_firmware < romepi_1.0.0.g cpe:2.3:o:amd:epyc_7642_firmware:*:*:*:*:*:*:*:*
amd epyc_7552_firmware < romepi_1.0.0.g cpe:2.3:o:amd:epyc_7552_firmware:*:*:*:*:*:*:*:*
amd epyc_7542_firmware < romepi_1.0.0.g cpe:2.3:o:amd:epyc_7542_firmware:*:*:*:*:*:*:*:*
amd epyc_7532_firmware < romepi_1.0.0.g cpe:2.3:o:amd:epyc_7532_firmware:*:*:*:*:*:*:*:*
amd epyc_7502p_firmware < romepi_1.0.0.g cpe:2.3:o:amd:epyc_7502p_firmware:*:*:*:*:*:*:*:*
amd epyc_7502_firmware < romepi_1.0.0.g cpe:2.3:o:amd:epyc_7502_firmware:*:*:*:*:*:*:*:*
amd epyc_7452_firmware < romepi_1.0.0.g cpe:2.3:o:amd:epyc_7452_firmware:*:*:*:*:*:*:*:*

References for CVE-2023-20578

cvelogic Threat Intelligence