CVE-2021-46762

SMU SRAM corruption via insufficient input validation

Published May 9, 2023 · Updated Jan 28, 2025

Improper input validation in the AMD SMU allows local users with high privileges to corrupt SMU SRAM on affected EPYC processors. AMD has not disclosed the specific SMU input path or operation that writes insufficiently validated data into SRAM. Exploitation has high complexity and requires no user interaction; successful corruption can damage SMU state or interrupt service.

CVSS severity3.9
Low
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in the AMD SMU allows local users with high privileges to corrupt SMU SRAM on affected EPYC processors. AMD has not disclosed the specific SMU input path or operation that writes insufficiently validated data into SRAM. Exploitation has high complexity and requires no user interaction; successful corruption can damage SMU state or interrupt service.

The record

CVE
CVE-2021-46762
Published
May 9, 2023
Updated
Jan 28, 2025
Vendor
Advanced Micro Devices, Inc.
Product
3rd Gen AMD EPYC Processors
Classifications
CWE-20, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 28, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=various

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Advanced Micro Devices, Inc. · 3rd Gen AMD EPYC Processorsversion=various
Advanced Micro Devices, Inc. · AMD EPYC Embedded 7003 Series Processorsversion=various
Advanced Micro Devices, Inc. · AMD EPYC Embedded 7002 Series Processorsversion=various
Advanced Micro Devices, Inc. · 2nd Gen AMD EPYC Processorsversion=various

Published CVSS scores

3.9Advanced Micro Devices, Inc.CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:L/A:L
9.1NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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