AMD Epyc 7643p Firmware vulnerabilities

18 CVEs affecting AMD Epyc 7643p Firmware, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2023-20591, published 2024-08-13.

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

• CVE-2023-20592, published 2023-11-14. Medium severity, CVSS 6.5. EPSS: 1% chance of exploitation in the next 30 days. Improper or unexpected behavior of the INVD instruction in some AMD CPUs may allow an attacker with a malicious hypervisor to affect cache line write-back behavior of the CPU leading to a potential…
• CVE-2021-46774, published 2023-11-14. High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days. Insufficient DRAM address validation in System Management Unit (SMU) may allow an attacker to read/write from/to an invalid DRAM address, potentially resulting in denial-of-service.
• CVE-2023-20533, published 2023-11-14. High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days. Insufficient DRAM address validation in System Management Unit (SMU) may allow an attacker to read/write from/to an invalid DRAM address, potentially resulting in denial-of-service.
• CVE-2024-21978, published 2024-08-05. High severity, CVSS 7.9. EPSS: 0.5% chance of exploitation in the next 30 days. Improper input validation in SEV-SNP could allow a malicious hypervisor to read or overwrite guest memory potentially leading to data leakage or data corruption.
• CVE-2023-31347, published 2024-02-13. Medium severity, CVSS 4.9. EPSS: 0.5% chance of exploitation in the next 30 days. Due to a code bug in Secure_TSC, SEV firmware may allow an attacker with high privileges to cause a guest to observe an incorrect TSC when Secure TSC is enabled potentially resulting in a loss of…
• CVE-2024-21980, published 2024-08-05. High severity, CVSS 7.9. EPSS: 0.4% chance of exploitation in the next 30 days. Improper restriction of write operations in SNP firmware could allow a malicious hypervisor to potentially overwrite a guest's memory or UMC seed resulting in loss of confidentiality and integrity.
• CVE-2023-31355, published 2024-08-05. Medium severity, CVSS 6.0. EPSS: 0.4% chance of exploitation in the next 30 days. Improper restriction of write operations in SNP firmware could allow a malicious hypervisor to overwrite a guest's UMC seed potentially allowing reading of memory from a decommissioned guest.
• CVE-2021-26345, published 2023-11-14. Medium severity, CVSS 4.9. EPSS: 0.4% chance of exploitation in the next 30 days. Failure to validate the value in APCB may allow a privileged attacker to tamper with the APCB token to force an out-of-bounds memory read potentially resulting in a denial of service.
• CVE-2023-20566, published 2023-11-14. High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days. Improper address validation in ASP with SNP enabled may potentially allow an attacker to compromise guest memory integrity.
• CVE-2022-23830, published 2023-11-14. Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days. SMM configuration may not be immutable, as intended, when SNP is enabled resulting in a potential limited loss of guest memory integrity.

Latest

• CVE-2023-20591, published 2024-08-13. Critical severity, CVSS 10.0. EPSS: 0.3% chance of exploitation in the next 30 days. Improper re-initialization of IOMMU during the DRTM event may permit an untrusted platform configuration to persist, allowing an attacker to read or modify hypervisor memory, potentially resulting in…
• CVE-2023-20584, published 2024-08-13. Medium severity, CVSS 6.0. EPSS: 0.2% chance of exploitation in the next 30 days. IOMMU improperly handles certain special address ranges with invalid device table entries (DTEs), which may allow an attacker with privileges and a compromised Hypervisor to induce DTE faults to…
• CVE-2023-20578, published 2024-08-13. Medium severity, CVSS 6.4. EPSS: 0.1% chance of exploitation in the next 30 days. A TOCTOU (Time-Of-Check-Time-Of-Use) in SMM may allow an attacker with ring0 privileges and access to the BIOS menu or UEFI shell to modify the communications buffer potentially resulting in…
• CVE-2021-26344, published 2024-08-13. High severity, CVSS 8.2. EPSS: 0.2% chance of exploitation in the next 30 days. An out of bounds memory write when processing the AMD PSP1 Configuration Block (APCB) could allow an attacker with access the ability to modify the BIOS image, and the ability to sign the resulting…
• CVE-2023-31346, published 2024-02-13. Medium severity, CVSS 6.0. EPSS: 0.3% chance of exploitation in the next 30 days. Failure to initialize memory in SEV Firmware may allow a privileged attacker to access stale data from other guests.
• CVE-2023-20573, published 2024-01-11. Low severity, CVSS 3.2. EPSS: 0.3% chance of exploitation in the next 30 days. A privileged attacker can prevent delivery of debug exceptions to SEV-SNP guests potentially resulting in guests not receiving expected debug information.