What is CVE-2023-20527?

CVE-2023-20527 is a medium-severity vulnerability in AMD 1st Gen Epyc, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2023-01-11.

How severe is CVE-2023-20527?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Improper input validation in AMD 1st Gen Epyc

CVE-2023-20527

Improper syscall input validation in the ASP Bootloader may allow a privileged attacker to read memory out-of-bounds, potentially leading to a denial-of-service.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2023-01-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (49.3th percentile), scored 2026-11-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1032 (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2023-20527?: CVE-2023-20527 is a medium-severity vulnerability in AMD 1st Gen Epyc, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2023-01-11.
How severe is CVE-2023-20527?: Medium severity. CVSS v3 base score is 6.5 out of 10.