Cyber Resilience

CVE-2023-20559

High

Published: 02 April 2023

Published
02 April 2023
Modified
25 February 2025
KEV Added
—
Patch
—
CVSS Score v3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0039 60.7th percentile
Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2023-20559 is a high-severity Insufficient Control Flow Management (CWE-691) vulnerability in Amd Ryzen 7 5700G Firmware. Its CVSS base score is 8.8 (High).

Operationally, ranked in the top 39.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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

CWE(s)
NVD-CWE-noinfoCWE-691

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

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
amd
ryzen 7 5825u firmware
≤ cezannepi-fp6_1.0.0.9
amd
ryzen 9 5900hx firmware
≤ cezannepi-fp6_1.0.0.9
+79 more product configuration(s) — see NVD for full list

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SA-24 Design For Cyber Resiliency
addresses: CWE-691

Design principles and implementation approaches enforce robust control-flow management to maintain function and enable recovery after disruption.

References