CVE-2023-20532Network attack vector

Service interruption via improper SMU resource locking

Published Jan 10, 2023 · Updated Apr 7, 2025

Improper input validation in AMD EPYC 7002 and 7003 SMU firmware allows attackers to interrupt service by locking resources. The SMU accepts an unspecified invalid input and improperly locks a resource, but AMD has not disclosed the input path or locking operation. CISA assesses network reachability without authentication; successful exploitation affects availability without reported data access or code execution.

CVSS severity5.3
Medium
EPSS probability0.56%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in AMD EPYC 7002 and 7003 SMU firmware allows attackers to interrupt service by locking resources. The SMU accepts an unspecified invalid input and improperly locks a resource, but AMD has not disclosed the input path or locking operation. CISA assesses network reachability without authentication; successful exploitation affects availability without reported data access or code execution.

The record

CVE
CVE-2023-20532
Published
Jan 10, 2023
Updated
Apr 7, 2025
Vendor
AMD
Product
AMD EPYC 7002 Series Processors
Classifications
CWE-20, T1499
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?

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  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

5.3CISA ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
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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