CVE-2023-20578

A TOCTOU (Time-Of-Check-Time-Of-Use) in SMM may allow an attacker with ring0 privileges and...

7.5 High

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.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: High
Privileges needed: High
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.12%Up 0.1 points since Aug 14, 2024

What each source reports

CVE List Score used 7.5

Record: CVE-2023-20578
CVSS 3.1: 7.5 HighCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-367
Updated: 2026-11-02

EUVDEUVD-2023-24757 7.5

Record: EUVD-2023-24757
CVSS 3.1: 7.5 HighCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-3phx-v48r-rmwc 7.5

A TOCTOU (Time-Of-Check-Time-Of-Use) in SMM may allow an attacker with ring0 privileges and...

Record: GHSA-3phx-v48r-rmwc
CVSS 3.1: 7.5 HighCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-367
Updated: 2026-11-02

NVD 7.5

Record: CVE-2023-20578
CVSS 3.1: 7.5 HighCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-367
Updated: 2026-11-02

Affected products

Show 117 moreShow less

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-20578 is a high vulnerability (CVSS 7.5) in Amd Epyc™ 7001 Processors, published August 13, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.12%, the 1st percentile. No source names a fixed version.