CVE-2023-20559

HIGHNVD 8.88.8—Trending — 3 sources updated this week

8.8

Insufficient control flow management in AmdCpmGpioInitSmm may allow a privileged attacker to tamper with the SMM handler potentially leading to escalation of privileges.

CVSS v3: 8.8
EG Score: 8.8(medium)
EPSS: 60.5%
KEV: Not listed

Published

April 2, 2023

Last Modified

February 25, 2025

References (2)

psirt@amdhttps://www.amd.com/en/resources/product-security/bulletin/amd-sb-1027.html
af854a3a-2127-422b-91ae-364da2661108https://www.amd.com/en/resources/product-security/bulletin/amd-sb-1027.html

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-691

Data Freshness Timeline

(refreshed 17× in last 7d / 18× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:43 UTCepss_batch
2026-05-29 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-25 03:57 UTCEG score recompute
2026-05-25 03:57 UTCGHSA enrichment
2026-05-24 02:32 UTCOSV refresh

Frequently asked(5)

What is CVE-2023-20559?

CVE-2023-20559 is a high vulnerability published on April 2, 2023. Insufficient control flow management in AmdCpmGpioInitSmm may allow a privileged attacker to tamper with the SMM handler potentially leading to escalation of privileges.

When was CVE-2023-20559 disclosed?

CVE-2023-20559 was first published in the National Vulnerability Database on April 2, 2023, with the most recent update on February 25, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-20559 actively exploited?

CVE-2023-20559 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 60.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-20559?

CVE-2023-20559 has a CVSS v3 base score of 8.8 (NVD).

How do I remediate CVE-2023-20559?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-20559, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2023-20559

📅 Published

🔄 Last Modified

🔗 References (2)