Cyber Resilience

CVE-2023-20578

Race Condition in Amd Epyc 8024Pn Firmware ≤ genoapi_1.0.0.2

Race Condition
Published
13 August 2024
Modified
18 March 2025
Patch / advisory
View advisory
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS Score 0.0012 2th percentile
Risk Priority 48 floored blend · peak EPSS

Summary

CVE-2023-20578 is a high-severity Time-of-check Time-of-use (TOCTOU) Race Condition (CWE-367) vulnerability in Amd Epyc 8024Pn Firmware. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Path Interception (T1034); ranked at the 2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to AC-25 (Reference Monitor) and AC-3 (Access Enforcement) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

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.

CWE(s)
CWE-367

Related Threats

MITRE ATT&CK Enterprise Techniques

T1034 Path Interception Persistence
**This technique has been deprecated.
attack.mitre.org →
T1548 Abuse Elevation Control Mechanism Privilege Escalation
Adversaries may circumvent mechanisms designed to control privilege elevation to gain higher-level permissions.
attack.mitre.org →
T1574 Hijack Execution Flow Stealth
Adversaries may execute their own malicious payloads by hijacking the way operating systems run programs.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-20521Same product: Amd Epyc 7001
CVE-2023-20523Same product: Amd Epyc 7232P
CVE-2023-20548Same vendor: Amd
CVE-2023-31324Same vendor: Amd
CVE-2023-20575Same product: Amd Epyc 7232P
CVE-2023-20592Same product: Amd Epyc 7001
CVE-2023-20573Same product: Amd Epyc 7203
CVE-2023-20526Same product: Amd Epyc 7001
CVE-2023-20591Same product: Amd Epyc 7203
CVE-2023-20566Same product: Amd Epyc 7203

Affected Assets

amd
epyc 8024pn firmware
≤ genoapi_1.0.0.2
amd
epyc 8024p firmware
≤ genoapi_1.0.0.2
amd
epyc 8124pn firmware
≤ genoapi_1.0.0.2
amd
epyc 8124p firmware
≤ genoapi_1.0.0.2
amd
epyc 8224pn firmware
≤ genoapi_1.0.0.2
amd
epyc 8224p firmware
≤ genoapi_1.0.0.2
amd
epyc 8324pn firmware
≤ genoapi_1.0.0.2
amd
epyc 8324p firmware
≤ genoapi_1.0.0.2
amd
epyc 8434pn firmware
≤ genoapi_1.0.0.2
amd
epyc 8434p firmware
≤ genoapi_1.0.0.2
+95 more product configuration(s) — see NVD for full list

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V15.4.2
  • V17.2.6

Mitigating Controls (NIST 800-53 r5) AI

AC-25 Reference Monitor good match

A reference monitor that is always invoked and analyzable structurally eliminates the non-atomic check-then-use pattern underlying TOCTOU.

AC-3 Access Enforcement partial match

Access enforcement that performs an atomic check-and-use decision directly stops the window in which a TOCTOU race can be exploited.

SC-39 Process Isolation partial match

Process isolation limits the blast radius of a successful TOCTOU exploitation but does not remove the race itself.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly include coding standards and reviews that prevent TOCTOU race conditions.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.17 Clock synchronization none match
none

Reliable, synchronized time across systems narrows the exploitable window in which a resource state can change between a security check and its use.

References