CVE-2023-20591 — Improper re-initialization of IOMMU during the DRTM event may permit an untruste

Improper re-initialization of IOMMU during the DRTM event may permit an untrusted platform configuration to persist, allowing an attacker to read or modify hypervisor memory, potentially resulting in loss of confidentiality, integrity, and availability.

01What is this vulnerability?

Improper re-initialization of IOMMU during the DRTM event may permit an untrusted platform configuration to persist, allowing an attacker to read or modify hypervisor memory, potentially resulting in loss of confidentiality, integrity, and availability.

02Affected products

Vendor	Product	Versions
AMD	AMD EPYC™ 7003 Series Processors	MilanPI 1.0.0.B
AMD	AMD EPYC™ 9004 Series Processors	Genoa 1.0.0.8
AMD	AMD EPYC™ Embedded 7003 Series Processors	EmbMilanPI-SP3 1.0.0.7
AMD	AMD EPYC™ Embedded 9003 Series Processors	EmbGenoaPI-SP5 1.0.0.3

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: 2024-08-13T16:53:23.681Z
• Last modified: 2025-03-13T16:41:15.645Z

09References

• www.amd.com — https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3003.html