CVE tracker / CVE-2023-20585

CVE-2023-20585

CVE-2023-20585 is the AMD: CVE-2023-20585 IOMMU Write Buffer Vulnerability. Microsoft rates it Important, CVSS 5.3. It is not in CISA's Known Exploited Vulnerabilities catalog. Published April 14, 2026.

Risk summary

MediumTampering
5.3
CVSS v3 base
under 0.1%
EPSS: chance of exploitation in 30 days
Medium
Severity
Important
Microsoft's rating
Less Likely
Microsoft: exploitation
No
In CISA KEV

Microsoft describes it: “The vulnerability assigned to this CVE could lead to corruption of guest encrypted memory. The mitigation for this vulnerability requires a Windows update. This CVE is being documented in the Security Update Guide to announce that the latest builds of Windows enable the mitigation and provide protection against the vulnerability. Please see the following for more information: * [https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3016.html].”

How to fix it

Microsoft lists 4 affected products and the update that fixes each:

What Microsoft changed

Details

Publicly disclosed (Microsoft)
No
Exploited (Microsoft)
No
Known exploited (CISA KEV)
Not listed
Published
April 14, 2026
Last revised
April 14, 2026

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References

Microsoft Security Update Guide NVD CVE record

From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.