CVE-2021-46774

What it is

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.

At a glance

Exploitability

Can be exploited locally on the machine with an admin-level account. High risk of data tampering.

Exploit odds

0.5% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2023-11-14 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 04:15 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.5% in the next 30 days (EPSS).
• Severity: 6.7 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2023-11-14 19:15 UTC

Last modified

2026-06-17 04:15 UTC

Exploit probability

0.5% · EPSS, next 30 days

Record status

Modified

Affected

• Amd Epyc 7001 Firmware < naplespi_1.0.0.k
• Amd Epyc 7251 Firmware < naplespi_1.0.0.k
• Amd Epyc 7261 Firmware < naplespi_1.0.0.k
• Amd Epyc 7281 Firmware < naplespi_1.0.0.k
• Amd Epyc 7301 Firmware < naplespi_1.0.0.k
• Amd Epyc 7351 Firmware < naplespi_1.0.0.k
• Amd Epyc 7351p Firmware < naplespi_1.0.0.k
• Amd Epyc 7371 Firmware < naplespi_1.0.0.k

Attack profile CVSS 3.1 · 6.7

Attack vector

Local

Complexity

High

Privileges needed

High

User interaction

None

Scope

Changed

Confidentiality

Low

Integrity

High

Availability

Low

Is it in your code?

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