How severe is CVE-2023-31355?

CVE-2023-31355 has a CVSS 3.x base score of 6.0, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2023-31355 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-31355?

CVE-2023-31355 primarily affects Amd Epyc 7203 Firmware. In total, 86 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-31355?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2023-31355 have an EU (EUVD) identifier?

Yes. CVE-2023-31355 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-35666.

When was CVE-2023-31355 published?

CVE-2023-31355 was published on 2024-08-05 and last updated on 2026-06-17.

CVE-2023-31355

CVE-2023-31355 is a medium-severity vulnerability in Amd Epyc 7203 Firmware with a CVSS 3.x base score of 6.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Medium (CVSS 3.x base score 6.0)
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-35666
Weakness: CWE-787
Affected product: Amd Epyc 7203 Firmware
Published: 2024-08-05
Last modified: 2026-06-17

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.

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 3.x base score of 6.0, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2023-31355 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-31355?: CVE-2023-31355 primarily affects Amd Epyc 7203 Firmware. In total, 86 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-31355?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2023-31355 have an EU (EUVD) identifier?: Yes. CVE-2023-31355 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-35666.
When was CVE-2023-31355 published?: CVE-2023-31355 was published on 2024-08-05 and last updated on 2026-06-17.

References

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

Affected products (86)

cpe:2.3:o:amd:epyc_7203_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7203p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_72f3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7303_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7303p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7313_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7313p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7343_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_73f3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7373x_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7413_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7443_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7443p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_74f3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7453_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7473x_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7513_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7543_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7543p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_75f3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7573x_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7643_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7773x_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7643p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7663_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7663p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7713_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7713p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7763_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8024pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8024p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8124pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8124p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8224pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8224p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8324pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8324p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8434pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8434p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_8534pn_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Amd Epyc 7203 Firmware

CVE-2024-21980 — High (CVSS 7.9): Improper restriction of write operations in SNP firmware could allow a malicious hypervisor to potentially overwrite a…
CVE-2023-20578 — High (CVSS 7.5): A TOCTOU (Time-Of-Check-Time-Of-Use) in SMM may allow an attacker with ring0 privileges and access to the BIOS menu or…
CVE-2021-26344 — High (CVSS 7.2): An out of bounds memory write when processing the AMD PSP1 Configuration Block (APCB) could allow an attacker with…
CVE-2021-46774 — Medium (CVSS 6.7): Insufficient DRAM address validation in System Management Unit (SMU) may allow an attacker to read/write from/to an…
CVE-2023-20591 — Medium (CVSS 6.5): Improper re-initialization of IOMMU during the DRTM event may permit an untrusted platform configuration to persist,…
CVE-2023-20592 — Medium (CVSS 6.5): Improper or unexpected behavior of the INVD instruction in some AMD CPUs may allow an attacker with a malicious…

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