What is CVE-2023-31355?

CVE-2023-31355 is a medium-severity vulnerability in Amd 3rd Gen Epyc™ Processors, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 6.0/10. Published 2024-08-05.

How severe is CVE-2023-31355?

Medium severity. CVSS v3 base score is 6.0 out of 10.

Is CVE-2023-31355 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Amd 3rd Gen Epyc™ Processors

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.

Vulnerability class: Buffer Overflow

EPSS: 0.008 (74.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N.

Affected products

Amd 3rd Gen Epyc™ Processors — versions various
Amd 4th Gen Epyc™ Processors — versions various
Amd Epyc™ Embedded 7003 — versions various
Amd Epyc™ Embedded 9003 — versions various

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

Public proof-of-concept exploits

References

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

Frequently asked questions

What is CVE-2023-31355?: CVE-2023-31355 is a medium-severity vulnerability in Amd 3rd Gen Epyc™ Processors, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 6.0/10. Published 2024-08-05.
How severe is CVE-2023-31355?: Medium severity. CVSS v3 base score is 6.0 out of 10.
Is CVE-2023-31355 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.