AMD Epyc 7743 Firmware vulnerabilities

16 CVEs affecting AMD Epyc 7743 Firmware, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2023-20594, published 2023-09-20.

Highest priority

Known exploited (CISA KEV) first, then by EPSS exploit probability.

CVE-2023-20531, published 2023-01-11. High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days. Insufficient bound checks in the SMU may allow an attacker to update the SRAM from/to address space to an invalid value potentially resulting in a denial of service.
CVE-2023-20530, published 2023-01-11. High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days. Insufficient input validation of BIOS mailbox messages in SMU may result in out-of-bounds memory reads potentially resulting in a denial of service.
CVE-2023-20529, published 2023-01-11. High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days. Insufficient bound checks in the SMU may allow an attacker to update the from/to address space to an invalid value potentially resulting in a denial of service.
CVE-2023-20527, published 2023-01-11. Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days. Improper syscall input validation in the ASP Bootloader may allow a privileged attacker to read memory out-of-bounds, potentially leading to a denial-of-service.
CVE-2023-20525, published 2023-01-11. Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days. Insufficient syscall input validation in the ASP Bootloader may allow a privileged attacker to read memory outside the bounds of a mapped register potentially leading to a denial of service.
CVE-2023-20532, published 2023-01-11. Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days. Insufficient input validation in the SMU may allow an attacker to improperly lock resources, potentially resulting in a denial of service.
CVE-2021-26316, published 2023-01-11. High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days. Failure to validate the communication buffer and communication service in the BIOS may allow an attacker to tamper with the buffer resulting in potential SMM (System Management Mode) arbitrary code…
CVE-2023-20528, published 2023-01-11. Low severity, CVSS 2.4. EPSS: 0.2% chance of exploitation in the next 30 days. Insufficient input validation in the SMU may allow a physical attacker to exfiltrate SMU memory contents over the I2C bus potentially leading to a loss of confidentiality.
CVE-2021-26398, published 2023-01-11. High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days. Insufficient input validation in SYS_KEY_DERIVE system call in a compromised user application or ABL may allow an attacker to corrupt ASP (AMD Secure Processor) OS memory which may lead to potential…
CVE-2023-20594, published 2023-09-20. Medium severity, CVSS 4.4. EPSS: 0.2% chance of exploitation in the next 30 days. Improper initialization of variables in the DXE driver may allow a privileged user to leak sensitive information via local access.

Latest

CVE-2023-20523, published 2023-01-11. Medium severity, CVSS 5.7. EPSS: 0.2% chance of exploitation in the next 30 days. TOCTOU in the ASP may allow a physical attacker to write beyond the buffer bounds, potentially leading to a loss of integrity or denial of service.
CVE-2021-26402, published 2023-01-11. High severity, CVSS 7.1. EPSS: 0.2% chance of exploitation in the next 30 days. Insufficient bounds checking in ASP (AMD Secure Processor) firmware while handling BIOS mailbox commands, may allow an attacker to write partially-controlled data out-of-bounds to SMM or SEV-ES…