What’s Vulnerable › Vulnerabilities

CVE-2023-20533

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-11-14 · updated 2026-06-17

Description

Insufficient DRAM address validation in System Management Unit (SMU) may allow an attacker to read/write from/to an invalid DRAM address, potentially resulting in denial-of-service.

Affected products

• AMD Epyc 7203 Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5
• AMD Epyc 7203P Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5
• AMD Epyc 7232P Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7252 Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7262 Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7272 Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7282 Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 72F3 Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5
• AMD Epyc 7302 Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7302P Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7303 Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5
• AMD Epyc 7303P Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5
• 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 7352 Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• 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 7402 Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7402P Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• 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
• AMD Epyc 7452 Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7453 Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5
• AMD Epyc 7473X Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5
• AMD Epyc 74F3 Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5
• AMD Epyc 7502 Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7502P Firmware: before romepi_1.0.0.d — fixed in romepi_1.0.0.d
• AMD Epyc 7513 Firmware: before milanpi_1.0.0.5 — fixed in milanpi_1.0.0.5

How to fix

Upgrade to a fixed version: AMD Epyc 7203 Firmware milanpi_1.0.0.5; AMD Epyc 7203P Firmware milanpi_1.0.0.5; AMD Epyc 7232P Firmware romepi_1.0.0.d; AMD Epyc 7252 Firmware romepi_1.0.0.d; AMD Epyc 7262 Firmware romepi_1.0.0.d; AMD Epyc 7272 Firmware romepi_1.0.0.d; AMD Epyc 7282 Firmware romepi_1.0.0.d; AMD Epyc 72F3 Firmware milanpi_1.0.0.5; AMD Epyc 7302 Firmware romepi_1.0.0.d; AMD Epyc 7302P Firmware romepi_1.0.0.d; AMD Epyc 7303 Firmware milanpi_1.0.0.5; AMD Epyc 7303P Firmware milanpi_1.0.0.5. Check the vendor advisory for mitigations.

References

• https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3002
• https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4002
• https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-5001
• https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3002
• https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4002
• https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-5001

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