CVE-2023-20531Network attack vector

Service interruption via invalid SMU SRAM ranges

Published Jan 10, 2023 · Updated Apr 7, 2025

Improper bounds checking in AMD EPYC 7002 and 7003 SMU firmware allows attackers to interrupt service via invalid SRAM ranges. The SMU accepts an out-of-range SRAM from/to address-space update because it does not validate the supplied bounds. AMD does not identify the interface or access prerequisites, or whether the resulting denial of service is a hang, crash, or reboot; no data exposure or modification is reported.

CVSS severity7.5
High
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper bounds checking in AMD EPYC 7002 and 7003 SMU firmware allows attackers to interrupt service via invalid SRAM ranges. The SMU accepts an out-of-range SRAM from/to address-space update because it does not validate the supplied bounds. AMD does not identify the interface or access prerequisites, or whether the resulting denial of service is a hang, crash, or reboot; no data exposure or modification is reported.

The record

CVE
CVE-2023-20531
Published
Jan 10, 2023
Updated
Apr 7, 2025
Vendor
AMD
Product
AMD EPYC 7002 Series Processors
Classifications
CWE-119, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

AMD · AMD EPYC 7002 Series Processorsversion=various
AMD · AMD EPYC 7003 Series 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
7.5NIST NVDCVSS: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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Endpoint Denial of Service: Application 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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