CVE-2023-20555

7.8 HIGH 0.3% exploit odds Fix listed

What it is

Insufficient input validation in CpmDisplayFeatureSmm may allow an attacker to corrupt SMM memory by overwriting an arbitrary bit in an attacker-controlled pointer potentially leading to arbitrary code execution in SMM.

At a glance

Exploitability: Can be exploited locally on the machine with a low-privilege account. High risk of data exposure, data tampering, service disruption.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2023-08-08 18:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 05:30 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.3% in the next 30 days (EPSS).
Severity: 7.8 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2023-08-08 18:15 UTC
Last modified: 2026-06-17 05:30 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Weakness: CWE-787 · Out-of-bounds write
Record status: Modified

Affected

Amd Ryzen 3 3300 Firmware < comboam4_pi_v1_1.0.0.a
Amd Ryzen 3 3300x Firmware < comboam4_pi_v1_1.0.0.a
Amd Ryzen 5 3600 Firmware < comboam4_pi_v1_1.0.0.a
Amd Ryzen 5 3600x Firmware < comboam4_pi_v1_1.0.0.a
Amd Ryzen 7 3700 Firmware < comboam4_pi_v1_1.0.0.a
Amd Ryzen 7 3700x Firmware < comboam4_pi_v1_1.0.0.a
Amd Ryzen 9 3800x Firmware < comboam4_pi_v1_1.0.0.a
Amd Ryzen 9 3850x Firmware < comboam4_pi_v1_1.0.0.a

Attack profile CVSS 3.1 · 7.8

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

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

Is it in your code?

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Read https://cve-list.com/agent/cve/CVE-2023-20555.md and follow it. Check whether this project is affected by CVE-2023-20555. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record