Cyber Resilience

CVE-2023-20523

Race Condition in Amd Epyc 7H12 Firmware ≤ romepi_1.0.0.c

Race Condition
Published
11 January 2023
Modified
07 April 2025
Patch / advisory
View advisory
CVSS Score v3.1 5.7
Click a component to see what it means
Raw vectorCVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS Score 0.0018 8th percentile
Risk Priority 41 floored blend · peak EPSS

Summary

CVE-2023-20523 is a medium-severity Time-of-check Time-of-use (TOCTOU) Race Condition (CWE-367) vulnerability in Amd Epyc 7H12 Firmware. Its CVSS base score is 5.7 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Path Interception (T1034); ranked at the 8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability Data

TOCTOU in the ASP may allow a physical attacker to write beyond the buffer bounds, potentially leading to a loss of integrity or denial of service.

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 7232P
CVE-2023-20578Same product: Amd Epyc 7232P
CVE-2023-20529Same product: Amd Epyc 7002
CVE-2023-20525Same product: Amd Epyc 7002
CVE-2023-20531Same product: Amd Epyc 7002
CVE-2023-20528Same product: Amd Epyc 7002
CVE-2023-20532Same product: Amd Epyc 7002
CVE-2023-20548Same vendor: Amd
CVE-2023-31324Same vendor: Amd
CVE-2023-20524Same product: Amd Epyc 7232P

Affected Assets

amd
epyc 7h12 firmware
≤ romepi_1.0.0.c
amd
epyc 7f72 firmware
≤ romepi_1.0.0.c
amd
epyc 7f52 firmware
≤ romepi_1.0.0.c
amd
epyc 7f32 firmware
≤ romepi_1.0.0.c
amd
epyc 7742 firmware
≤ romepi_1.0.0.c
amd
epyc 7702p firmware
≤ romepi_1.0.0.c
amd
epyc 7702 firmware
≤ romepi_1.0.0.c
amd
epyc 7662 firmware
≤ romepi_1.0.0.c
amd
epyc 7642 firmware
≤ romepi_1.0.0.c
amd
epyc 7552 firmware
≤ romepi_1.0.0.c
+40 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

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

AU-8 Time Stamps
addresses: CWE-367

Timestamps meeting UTC or offset standards help identify TOCTOU issues through precise chronological reconstruction of check/use operations.

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