CVE-2023-20599 — Improper register access control in ASP may allow a privileged attacker to perfo

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.

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
AMD	AMD EPYC™ 7002 Series Processors	RomePI 100H SEV 0.24.19 [hex 00.18.13]
AMD	AMD Ryzen™ Threadripper™ 3000 Processors	CastlePeakPI-SP3r3_1.0.0.F
AMD	AMD Ryzen™ Threadripper™ PRO 3000 WX Processors	ChagallWSPI-sWRX8 1.0.0.C, CastlePeakWSPI-sWRX8 1.0.0.H
AMD	AMD Ryzen™ 3000 Series Mobile Processors with Radeon™ Graphics	PicassoPI-FP5_1.0.1.2c
AMD	AMD EPYC™ Embedded 7002 Series Processors	EmbRomePI-SP3 1.0.0.B
AMD	AMD EPYC™ Embedded 7003 Series Processors	EmbMilanPI-SP3 1.0.0.8
AMD	AMD Ryzen™ Embedded R1000 Series Processors	EmbeddedPI-FP5 1211
AMD	AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics	EmbeddedPI-FP5 1211
AMD	AMD Ryzen™ Embedded R2000 Series Processors	EmbeddedR2KPI-FP5 1006
AMD	AMD Ryzen™ Embedded V1000 Series Processors	EmbeddedPI-FP5 1211 RC1

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2025-06-10T16:15:03.641Z
• Last modified: 2026-02-26T17:51:02.287Z

09References

• www.amd.com — https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-7039.html