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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (34.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
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
- www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4001 (vendor-advisory, Vendor Advisory)
- www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3001 (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.