Vulnerability in Amd 1st Gen Epyc™ Processors
CVE-2021-26356
A TOCTOU in ASP bootloader may allow an attacker to tamper with the SPI ROM following data read to memory potentially resulting in S3 data corruption and information disclosure.
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
EPSS: 0.004 (32.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Amd 1st Gen Epyc™ Processors — versions various
- Amd 2nd Gen Epyc™ Processors — versions various
- Amd 3rd Gen Epyc™ Processors — versions various
- Amd 3rd Gen Ryzen™ Threadripper™ Processors “Castle Peak” Hedt — versions various
- Amd Ryzen™ 5000 Series Desktop Processors “Vermeer” Am4 — versions various
- Amd Epyc_7001
- Amd Epyc_7001_firmware
- Amd Epyc_7002
- Amd Epyc_7002_firmware
- Amd Epyc_7232p
Weakness classification (CWE)
References
- psirt@amd.com (vendor-advisory, Vendor Advisory)
- psirt@amd.com (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-26356?
- CVE-2021-26356 is a high-severity vulnerability in Amd 1st Gen Epyc™ Processors, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.4/10. Published 2023-05-09.
- How severe is CVE-2021-26356?
- High severity. CVSS v3 base score is 7.4 out of 10.