CVE-2021-46764Network attack vector

Service interruption via unchecked DRAM addresses

Published May 9, 2023 · Updated Jan 28, 2025

Out-of-bounds write in the SMU on AMD 2nd and 3rd Gen EPYC processors allows attackers to deny service by corrupting ASP memory. The System Management Unit fails to validate supplied DRAM addresses before using them for writes, permitting sensitive AMD Secure Processor memory to be overwritten. AMD has not published the access conditions or exact form of service interruption produced by successful corruption.

CVSS severity7.5
High
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in the SMU on AMD 2nd and 3rd Gen EPYC processors allows attackers to deny service by corrupting ASP memory. The System Management Unit fails to validate supplied DRAM addresses before using them for writes, permitting sensitive AMD Secure Processor memory to be overwritten. AMD has not published the access conditions or exact form of service interruption produced by successful corruption.

The record

CVE
CVE-2021-46764
Published
May 9, 2023
Updated
Jan 28, 2025
Vendor
Advanced Micro Devices, Inc.
Product
3rd Gen AMD EPYC Processors
Classifications
CWE-787, T1499
Attack vector
network
Privileges
unauthenticated

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?

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  1. Affected versionversion=various

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

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

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

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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