CVE-2023-20559

8.8 HIGH 0.7% exploit odds Fix listed

What it is

Insufficient control flow management in AmdCpmGpioInitSmm may allow a privileged attacker to tamper with the SMM handler potentially leading to escalation of privileges.

At a glance

Exploitability: Can be exploited over the network with a low-privilege account. High risk of data exposure, data tampering, service disruption.
Exploit odds: 0.7% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2023-04-02 21:15 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: 0.7% in the next 30 days (EPSS).
Severity: 8.8 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2023-04-02 21:15 UTC
Last modified: 2026-06-17 05:30 UTC
Exploit probability: 0.7% · EPSS, next 30 days
Weakness: CWE-691
Record status: Modified

Affected

Amd Ryzen 7 5700g Firmware < comboam4_v2_pi_1.2.0.6c
Amd Ryzen 7 5700ge Firmware < comboam4_v2_pi_1.2.0.6c
Amd Ryzen 5 5600g Firmware < comboam4_v2_pi_1.2.0.6c
Amd Ryzen 5 5600ge Firmware < comboam4_v2_pi_1.2.0.6c
Amd Ryzen 3 5300g Firmware < comboam4_v2_pi_1.2.0.6c
Amd Ryzen 3 5300ge Firmware < comboam4_v2_pi_1.2.0.6c
Amd Ryzen 9 5980hx Firmware < cezannepi-fp6_1.0.0.9
Amd Ryzen 9 5980hs Firmware < cezannepi-fp6_1.0.0.9

Attack profile CVSS 3.1 · 8.8

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

Raw vector

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

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record