How severe is CVE-2021-46755?

CVE-2021-46755 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-46755 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-46755?

CVE-2021-46755 primarily affects Amd Ryzen 5500 Firmware. In total, 46 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-46755?

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-2021-46755 published?

CVE-2021-46755 was published on 2023-05-09 and last updated on 2026-06-17.

CVE-2021-46755

CVE-2021-46755 is a high-severity vulnerability in Amd Ryzen 5500 Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Amd Ryzen 5500 Firmware
Published: 2023-05-09
Last modified: 2026-06-17

Description

Failure to unmap certain SysHub mappings in error paths of the ASP (AMD Secure Processor) bootloader may allow an attacker with a malicious bootloader to exhaust the SysHub resources resulting in a potential denial of service.

Frequently asked questions

What is CVE-2021-46755?: Failure to unmap certain SysHub mappings in error paths of the ASP (AMD Secure Processor) bootloader may allow an attacker with a malicious bootloader to exhaust the SysHub resources resulting in a potential denial of service.
How severe is CVE-2021-46755?: CVE-2021-46755 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-46755 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-46755?: CVE-2021-46755 primarily affects Amd Ryzen 5500 Firmware. In total, 46 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-46755?: 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-2021-46755 published?: CVE-2021-46755 was published on 2023-05-09 and last updated on 2026-06-17.

References

https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4001

Affected products (46)

cpe:2.3:o:amd:ryzen_5500_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5500_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5600_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5600_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5600g_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5600g_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5600x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5600x_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5700g_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5700g_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5700x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5700x_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5800x3d_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5800x3d_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5800x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5800x_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5900x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5900x_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5950x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_5950x_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3100_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3100_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3300x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3300x_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3500_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3500_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3500x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3500x_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3600_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3600_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3600x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3600x_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3600xt_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3600xt_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3800x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3800x_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3800xt_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3800xt_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3900_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
cpe:2.3:o:amd:ryzen_3900_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*

More vulnerabilities in Amd Ryzen 5500 Firmware

CVE-2021-46754 — Critical (CVSS 9.1): Insufficient input validation in the ASP (AMD Secure Processor) bootloader may allow an attacker with a compromised…
CVE-2021-46753 — Critical (CVSS 9.1): Failure to validate the length fields of the ASP (AMD Secure Processor) sensor fusion hub headers may allow an attacker…
CVE-2021-46773 — High (CVSS 8.8): Insufficient input validation in ABL may enable a privileged attacker to corrupt ASP memory, potentially resulting in a…
CVE-2021-46794 — High (CVSS 7.5): Insufficient bounds checking in ASP (AMD Secure Processor) may allow for an out of bounds read in SMI (System…
CVE-2021-46765 — High (CVSS 7.5): Insufficient input validation in ASP may allow an attacker with a compromised SMM to induce out-of-bounds memory reads…
CVE-2021-46749 — High (CVSS 7.5): Insufficient bounds checking in ASP (AMD Secure Processor) may allow for an out of bounds read in SMI (System…

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