Unauthorized Access to AMD Secure Processor’s Crypto-Co-Processor
Summary
A security researcher has reported to AMD a potential vulnerability which could allow a privileged attacker to access the Crypto Co-Processor (CCP) registers from the x86 architecture.
CVE Details
Refer to Glossary for explanation of terms
| CVE | CVSS Score | CVE Description |
| CVE-2023-20599 | 7.9 (High) CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N |
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. |
Affected Products and Mitigations
AMD recommends updating to the Platform Initialization (PI) firmware versions listed below.
AMD EPYC™ Series Processors
| Product | CVE ID | Mitigation | Release Date | Notes |
| AMD EPYC™ 7001 Series Processors | CVE-2023-20599 | Not Affected | ||
| AMD EPYC™ 7002 Series Processors | CVE-2023-20599 | RomePI 1.0.0.H SEV 0.24.19 [hex 00.18.13] |
2023-11-07 | N/A |
| AMD EPYC™ 7003 Series Processors | CVE-2023-20599 | MilanPI 1.0.0.C SEV 1.55.11 [hex 1.37.0B] |
2023-12-18 | TCB[SNP] >= 0x11 |
| AMD EPYC™ 9004 Series Processors | CVE-2023-20599 | Not Affected | ||
AMD Ryzen™ Series Processor
| Product | CVE ID | Mitigation | Release Date |
| AMD Ryzen™ Threadripper™ 3000 Processors | CVE-2023-20599 | CastlePeakPI-SP3r3_1.0.0.F | 2025-04-08 |
| AMD Ryzen™ Threadripper™ PRO 3000 WX Processors | CVE-2023-20599 | ChagallWSPI-sWRX8 1.0.0.C |
2025-04-03 |
| CastlePeakWSPI-sWRX8 1.0.0.H |
2025-03-31 | ||
| AMD Ryzen™ Threadripper™ PRO 5000 WX Processors | CVE-2023-20599 | ChagallWSPI-sWRX8 1.0.0.C |
2025-04-03 |
| AMD Ryzen™ 3000 Series Mobile Processors with Radeon™ Graphics | CVE-2023-20599 | PicassoPI-FP5_1.0.1.2c | 2025-04-03 |
| AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics | CVE-2023-20599 | PicassoPI-FP5_1.0.1.2c | 2025-04-03 |
AMD Embedded Series Processors
| Product | CVE ID | Mitigation | Release Date |
| AMD EPYC™ Embedded 7002 Series Processors | CVE-2023-20599 | EmbRomePI-SP3 1.0.0.B |
2023-12-15 |
| AMD EPYC™ Embedded 7003 Series Processors | CVE-2023-20599 | EmbMilanPI-SP3 1.0.0.8 |
2024-01-15 |
| AMD Ryzen™ Embedded R1000 Series Processors | CVE-2023-20599 | TBD | Target release August 2025 |
| AMD Ryzen™ Embedded R2000 Series Processors | CVE-2023-20599 | TBD | Target release August 2025 |
| AMD Ryzen™ Embedded V1000 Series Processors | CVE-2023-20599 | TBD | Target release August 2025 |
Acknowledgement
AMD thanks Oracle security researcher Hugo Magalhaes for reporting this issue and engaging in coordinated vulnerability disclosure
Revisions
| Revision Date | Description |
| 2025-06-10 | Initial publication |
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