CVE-2023-31355

Name: CVE-2023-31355
Creator: NVD / NIST
Published: 2024-08-05T16:15:34.51+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6/10EPSS 0.44%

Last modified Jun 17, 2026

CVE-2023-31355 is a medium-severity vulnerability rated 6/10 on the CVSS scale. Improper restriction of write operations in SNP firmware could allow a malicious hypervisor to overwrite a guest's UMC seed potentially allowing reading of memory from a decommissioned guest.. EPSS estimates a 0.44% chance of exploitation in the next 30 days.

Description

Improper restriction of write operations in SNP firmware could allow a malicious hypervisor to overwrite a guest's UMC seed potentially allowing reading of memory from a decommissioned guest.

Metrics

CVSS 3.1

6/10

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

EPSS Probability

0.44%

35.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Amd	Epyc 7203 Firmware	< milanpi_1.0.0.d
Amd	Epyc 7203p Firmware	< milanpi_1.0.0.d
Amd	Epyc 72f3 Firmware	< milanpi_1.0.0.d
Amd	Epyc 7303 Firmware	< milanpi_1.0.0.d
Amd	Epyc 7303p Firmware	< milanpi_1.0.0.d
Amd	Epyc 7313 Firmware	< milanpi_1.0.0.d
Amd	Epyc 7313p Firmware	< milanpi_1.0.0.d
Amd	Epyc 7343 Firmware	< milanpi_1.0.0.d
Amd	Epyc 73f3 Firmware	< milanpi_1.0.0.d
Amd	Epyc 7373x Firmware	< milanpi_1.0.0.d
Amd	Epyc 7413 Firmware	< milanpi_1.0.0.d
Amd	Epyc 7443 Firmware	< milanpi_1.0.0.d
Amd	Epyc 7443p Firmware	< milanpi_1.0.0.d
Amd	Epyc 74f3 Firmware	< milanpi_1.0.0.d
Amd	Epyc 7453 Firmware	< milanpi_1.0.0.d
Amd	Epyc 7473x Firmware	< milanpi_1.0.0.d
Amd	Epyc 7513 Firmware	< milanpi_1.0.0.d
Amd	Epyc 7543 Firmware	< milanpi_1.0.0.d
Amd	Epyc 7543p Firmware	< milanpi_1.0.0.d
Amd	Epyc 75f3 Firmware	< milanpi_1.0.0.d
Amd	Epyc 7573x Firmware	< milanpi_1.0.0.d
Amd	Epyc 7643 Firmware	< milanpi_1.0.0.d
Amd	Epyc 7773x Firmware	< milanpi_1.0.0.d
Amd	Epyc 7643p Firmware	< milanpi_1.0.0.d
Amd	Epyc 7663 Firmware	< milanpi_1.0.0.d
Amd	Epyc 7663p Firmware	< milanpi_1.0.0.d
Amd	Epyc 7713 Firmware	< milanpi_1.0.0.d
Amd	Epyc 7713p Firmware	< milanpi_1.0.0.d
Amd	Epyc 7763 Firmware	< milanpi_1.0.0.d
Amd	Epyc 8024pn Firmware	< genoapi_1.0.0.c
Amd	Epyc 8024p Firmware	< genoapi_1.0.0.c
Amd	Epyc 8124pn Firmware	< genoapi_1.0.0.c
Amd	Epyc 8124p Firmware	< genoapi_1.0.0.c
Amd	Epyc 8224pn Firmware	< genoapi_1.0.0.c
Amd	Epyc 8224p Firmware	< genoapi_1.0.0.c
Amd	Epyc 8324pn Firmware	< genoapi_1.0.0.c
Amd	Epyc 8324p Firmware	< genoapi_1.0.0.c
Amd	Epyc 8434pn Firmware	< genoapi_1.0.0.c
Amd	Epyc 8434p Firmware	< genoapi_1.0.0.c
Amd	Epyc 8534pn Firmware	< genoapi_1.0.0.c
Amd	Epyc 8534p Firmware	< genoapi_1.0.0.c
Amd	Epyc 9734 Firmware	< genoapi_1.0.0.c
Amd	Epyc 9754s Firmware	< genoapi_1.0.0.c
Amd	Epyc 9754 Firmware	< genoapi_1.0.0.c
Amd	Epyc 9184x Firmware	< genoapi_1.0.0.c
Amd	Epyc 9384x Firmware	< genoapi_1.0.0.c
Amd	Epyc 9684x Firmware	< genoapi_1.0.0.c
Amd	Epyc 9124 Firmware	< genoapi_1.0.0.c
Amd	Epyc 9174f Firmware	< genoapi_1.0.0.c
Amd	Epyc 9224 Firmware	< genoapi_1.0.0.c

Showing 50 of 86 affected configurations. See NVD for the full list.

References

https://https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3011.htmlBroken Link

Timeline

Published: Aug 5, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2023-31355?

Improper restriction of write operations in SNP firmware could allow a malicious hypervisor to overwrite a guest's UMC seed potentially allowing reading of memory from a decommissioned guest.

How severe is CVE-2023-31355?

CVE-2023-31355 has a CVSS score of 6/10 (MEDIUM severity). The EPSS model estimates a 0.44% probability of exploitation in the next 30 days.

How do I fix CVE-2023-31355?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-31355?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST