CVE-2023-31346

Cross-guest data disclosure via uninitialized firmware memory

Published Feb 13, 2024 · Updated Mar 20, 2025

Improper memory initialization in AMD SEV firmware on 3rd and 4th Gen EPYC processors allows local users to read stale guest data. The SEV firmware fails to initialize memory before reuse, leaving data from one confidential guest accessible from another guest context. Exploitation requires high local privileges on an affected SEV-SNP host and exposes residual guest data without reported integrity or availability effects.

CVSS severity6.0
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper memory initialization in AMD SEV firmware on 3rd and 4th Gen EPYC processors allows local users to read stale guest data. The SEV firmware fails to initialize memory before reuse, leaving data from one confidential guest accessible from another guest context. Exploitation requires high local privileges on an affected SEV-SNP host and exposes residual guest data without reported integrity or availability effects.

The record

CVE
CVE-2023-31346
Published
Feb 13, 2024
Updated
Mar 20, 2025
Vendor
Advanced Micro Devices, Inc.
Product
AMD EPYC 4th Gen Processors
Classifications
CWE-284, T1005
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Feb 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 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 vectorlocal
Required privilegesadmin

What is affected?

Advanced Micro Devices, Inc. · AMD EPYC 4th Gen Processorsversion=various
Advanced Micro Devices, Inc. · AMD EPYC™ 7003 Series Processorsversion=various

Published CVSS scores

6.0CISA-ADPCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
6.0NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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