CVE-2023-20528

Physical SMU memory disclosure via I2C input

Published Jan 10, 2023 · Updated Apr 7, 2025

Information disclosure in the SMU of AMD EPYC 7002 and 7003 Series Processors allows physically proximate attackers to read SMU memory over I2C. The SMU insufficiently validates I2C input, permitting bus access to expose SMU memory contents. Physical access and I2C bus equipment are required, and the reported consequence is limited to confidentiality loss.

CVSS severity2.4
Low
EPSS probability0.24%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the SMU of AMD EPYC 7002 and 7003 Series Processors allows physically proximate attackers to read SMU memory over I2C. The SMU insufficiently validates I2C input, permitting bus access to expose SMU memory contents. Physical access and I2C bus equipment are required, and the reported consequence is limited to confidentiality loss.

The record

CVE
CVE-2023-20528
Published
Jan 10, 2023
Updated
Apr 7, 2025
Vendor
AMD
Product
AMD EPYC 7002 Series Processors
Classifications
CWE-20
Attack vector
physical
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?

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  1. Affected versionversion=various

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

AMD · AMD EPYC 7002 Series Processorsversion=various
AMD · AMD EPYC 7003 Series Processorsversion=various

Published CVSS scores

2.4CISA-ADPCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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.

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No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation

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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