CVE-2023-20527

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-01-11 · updated 2026-06-17
Weakness: CWE-20

Description

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.

Affected products

AMD Epyc 7001 Firmware: before naplespi_1.0.0.g — fixed in naplespi_1.0.0.g
AMD Epyc 7002 Firmware: before romepi_1.0.0.c — fixed in romepi_1.0.0.c
AMD Epyc 7003 Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5
AMD Epyc 7232P Firmware: before romepi_1.0.0.c — fixed in romepi_1.0.0.c
AMD Epyc 7251 Firmware: before naplespi_1.0.0.g — fixed in naplespi_1.0.0.g
AMD Epyc 7252 Firmware: before romepi_1.0.0.c — fixed in romepi_1.0.0.c
AMD Epyc 7261 Firmware: before naplespi_1.0.0.g — fixed in naplespi_1.0.0.g
AMD Epyc 7262 Firmware: before romepi_1.0.0.c — fixed in romepi_1.0.0.c
AMD Epyc 7272 Firmware: before romepi_1.0.0.c — fixed in romepi_1.0.0.c
AMD Epyc 7281 Firmware: before naplespi_1.0.0.g — fixed in naplespi_1.0.0.g
AMD Epyc 7282 Firmware: before romepi_1.0.0.c — fixed in romepi_1.0.0.c
AMD Epyc 72F3 Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5
AMD Epyc 7301 Firmware: before naplespi_1.0.0.g — fixed in naplespi_1.0.0.g
AMD Epyc 7302 Firmware: before romepi_1.0.0.c — fixed in romepi_1.0.0.c
AMD Epyc 7302P Firmware: before romepi_1.0.0.c — fixed in romepi_1.0.0.c
AMD Epyc 7313 Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5
AMD Epyc 7313P Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5
AMD Epyc 7343 Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5
AMD Epyc 7351 Firmware: before naplespi_1.0.0.g — fixed in naplespi_1.0.0.g
AMD Epyc 7352 Firmware: before romepi_1.0.0.c — fixed in romepi_1.0.0.c
AMD Epyc 7371 Firmware: before naplespi_1.0.0.g — fixed in naplespi_1.0.0.g
AMD Epyc 7373X Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5
AMD Epyc 73F3 Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5
AMD Epyc 7401 Firmware: before naplespi_1.0.0.g — fixed in naplespi_1.0.0.g
AMD Epyc 7401P Firmware: before naplespi_1.0.0.g — fixed in naplespi_1.0.0.g
AMD Epyc 7402 Firmware: before romepi_1.0.0.c — fixed in romepi_1.0.0.c
AMD Epyc 7402P Firmware: before romepi_1.0.0.c — fixed in romepi_1.0.0.c
AMD Epyc 7413 Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5
AMD Epyc 7443 Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5
AMD Epyc 7443P Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5

How to fix

Upgrade to a fixed version: AMD Epyc 7001 Firmware naplespi_1.0.0.g; AMD Epyc 7002 Firmware romepi_1.0.0.c; AMD Epyc 7003 Firmware milanpi_1.0.0.5; AMD Epyc 7232P Firmware romepi_1.0.0.c; AMD Epyc 7251 Firmware naplespi_1.0.0.g; AMD Epyc 7252 Firmware romepi_1.0.0.c; AMD Epyc 7261 Firmware naplespi_1.0.0.g; AMD Epyc 7262 Firmware romepi_1.0.0.c; AMD Epyc 7272 Firmware romepi_1.0.0.c; AMD Epyc 7281 Firmware naplespi_1.0.0.g; AMD Epyc 7282 Firmware romepi_1.0.0.c; AMD Epyc 72F3 Firmware milanpi_1.0.0.5. Check the vendor advisory for mitigations.

References

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