Security Resilience

CVE-2023-20599

Published
10 June 2025
Modified
15 April 2026
CVSS Score v3.1 7.9
Click a component to see what it means
Raw vectorCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
EPSS Score 0.0018 7th percentile
Risk Priority 50 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2023-20599 is a high-severity Improper Access Control for Register Interface (CWE-1262) vulnerability in Amd (inferred from references). Its CVSS base score is 7.9 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Junk Data (T1001.001); ranked at the 7th 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-3 (Access Enforcement) and AC-6 (Least Privilege) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

Improper register access control in ASP may allow a privileged attacker to perform unauthorized access to ASP’s Crypto Co-Processor (CCP) registers from x86 resulting in potential loss of control of cryptographic key pointer/index leading to loss of integrity or confidentiality.

CWE(s)
CWE-1262

Related Threats

MITRE ATT&CK Enterprise Techniques

T1001.001 Junk Data Command And Control
Adversaries may add junk data to protocols used for command and control to make detection more difficult.
attack.mitre.org →
T1001.002 Steganography Command And Control
Adversaries may use steganographic techniques to hide command and control traffic to make detection efforts more difficult.
attack.mitre.org →
T1001.003 Protocol or Service Impersonation Command And Control
Adversaries may impersonate legitimate protocols or web service traffic to disguise command and control activity and thwart analysis efforts.
attack.mitre.org →
T1003.001 LSASS Memory Credential Access
Adversaries may attempt to access credential material stored in the process memory of the Local Security Authority Subsystem Service (LSASS).
attack.mitre.org →
T1003.003 NTDS Credential Access
Adversaries may attempt to access or create a copy of the Active Directory domain database in order to steal credential information, as well as obtain other information about domain members such as devices, users, and access rights.
attack.mitre.org →
T1003.004 LSA Secrets Credential Access
Adversaries with SYSTEM access to a host may attempt to access Local Security Authority (LSA) secrets, which can contain a variety of different credential materials, such as credentials for service accounts.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-47385Shared CWE-1262
CVE-2024-6354Shared CWE-1262
CVE-2024-45556Shared CWE-1262
CVE-2025-36194Shared CWE-1262
CVE-2025-54509Shared CWE-1262
CVE-2025-1882Shared CWE-1262
CVE-2024-57492Shared CWE-1262

Affected Assets

Amd
—
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

AC-3 Access Enforcement good match

Enforcing approved authorizations for logical access directly stops unauthorized software from reaching memory-mapped registers.

AC-6 Least Privilege good match

Least-privilege assignment restricts which processes may access hardware registers, reducing the chance of improper interface exposure.

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.AA-05 partial match
blocks

Defining, enforcing, and reviewing access permissions and least privilege directly addresses unauthorized register access.

PR.IR-01 partial match
blocks

Protecting environments from unauthorized logical access can prevent improper register-interface usage.

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.5.1 Policies for information security partial match
removes
A.5.15 Access control partial match
removes

A.5.15 only requires that owners define, document and communicate an access-control policy plus rules; it never mandates that those rules be enforced on hardware register interfaces, so the improper-access-control flaw in the product remains present afterwards.

A.5.18 Access rights partial match
removes

A.5.18 governs the provisioning, review, and revocation of access rights to information/assets per business rules; it does not design, implement, or alter the hardware register interface itself, so the improper access control flaw in the product remains present.

A.5.7 Threat intelligence partial match
removes
A.8.2 Privileged access rights partial match
blocks

Privileged access rights directly restrict who can read/write hardware registers.

A.8.26 Application security requirements partial match
removes

References