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Vulnerability record · CVE-2021-46792 · published 9 May 2023

CVE-2021-46792: Amd ryzen 5300g firmware toctou race condition vulnerability

AAmd · Ryzen 5300g Firmware

Time-of-check Time-of-use (TOCTOU) in the BIOS2PSP command may allow an attacker with a malicious BIOS to create a race condition causing the ASP bootloader to perform out-of-bounds SRAM reads upon an S3 resume event potentially leading to a denial of service.

5.9 CVSS 3.1 Medium EPSS 0.40% · top 68.9% CWE-367 · TOCTOU race condition
5.9CVSS 3.1 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
55Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Time-of-check Time-of-use (TOCTOU) in the BIOS2PSP command may allow an attacker with a malicious BIOS to create a race condition causing the ASP bootloader to perform out-of-bounds SRAM reads upon an S3 resume event potentially leading to a denial of service.

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

Affected products

55 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.1CVE-2021-46754Amd ryzen 5300g firmware improper input validation vulnerabilityInsufficient input validation in the ASP (AMD Secure Processor) bootloader may allow an attacker with a compromised Uapp or ABL to coerce the bootloa…EPSS 0.57%9.1CVE-2021-46753Amd ryzen 6600h firmware vulnerabilityFailure to validate the length fields of the ASP (AMD Secure Processor) sensor fusion hub headers may allow an attacker with a malicious Uapp or ABL …EPSS 0.56%8.8CVE-2021-46773Amd ryzen 6600h firmware improper input validation vulnerabilityInsufficient input validation in ABL may enable a privileged attacker to corrupt ASP memory, potentially resulting in a loss of integrity or code exe…EPSS 0.77%8.2CVE-2022-23815Amd athlon silver 3050u firmware out-of-bounds write vulnerabilityImproper bounds checking in APCB firmware may allow an attacker to perform an out of bounds write, corrupting the APCB entry, potentially leading to …EPSS 0.16%7.8CVE-2023-20555Amd ryzen 3 3300 firmware out-of-bounds write vulnerabilityInsufficient input validation in CpmDisplayFeatureSmm may allow an attacker to corrupt SMM memory by overwriting an arbitrary bit in an attacker-cont…EPSS 0.32%7.8CVE-2021-26316Amd epyc 7h12 firmware improper input validation vulnerabilityFailure to validate the communication buffer and communication service in the BIOS may allow an attacker to tamper with the buffer resulting in poten…EPSS 0.26%7.5CVE-2021-46794Amd ryzen 5300g firmware out-of-bounds read vulnerabilityInsufficient bounds checking in ASP (AMD Secure Processor) may allow for an out of bounds read in SMI (System Management Interface) mailbox checksum …EPSS 0.62%7.5CVE-2021-46749Amd ryzen 5300g firmware out-of-bounds read vulnerabilityInsufficient bounds checking in ASP (AMD Secure Processor) may allow for an out of bounds read in SMI (System Management Interface) mailbox checksum …EPSS 0.62%

Source: NIST National Vulnerability Database (record CVE-2021-46792), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.