CVE-2023-20555

CVE-2023-20555 is a high-severity vulnerability in Amd Ryzen 3 3300 Firmware with a CVSS 3.x base score of 7.8. 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: High (CVSS 3.x base score 7.8)
• EPSS exploit prediction: 0% (22nd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-787
• Affected product: Amd Ryzen 3 3300 Firmware
• Published: 2023-08-08
• Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2023-20555?

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.

How severe is CVE-2023-20555?

CVE-2023-20555 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-20555 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-20555?

CVE-2023-20555 primarily affects Amd Ryzen 3 3300 Firmware. In total, 119 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-20555?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-20555 published?

CVE-2023-20555 was published on 2023-08-08 and last updated on 2026-06-17.

References

• https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4003

Affected products (119)

• cpe:2.3:o:amd:ryzen_3_3300_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_3_3300x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_5_3600_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_5_3600x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_7_3700_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_7_3700x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_9_3800x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_9_3850x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_9_5950x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_9_5900x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_9_5900_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_9_pro_5945_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_7_5800x3d_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_7_5800x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_7_5800_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_7_5700x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_7_pro_5845_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_5_5600x3d_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_5_5600x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_5_5600_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_5_pro_5645_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_7_5700_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_5_5500_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_3_5100_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_7_5700g_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_7_5700ge_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_5_5600g_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_5_5600ge_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_3_5300g_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_3_5300ge_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_9_7950x3d_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_9_7950x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_9_7900x3d_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_9_7900x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_9_7900_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_9_pro_7945_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_7_7800x3d_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_7_7700x_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_7_7700_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:amd:ryzen_7_pro_7745_firmware:*:*:*:*:*:*:*:*

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