Vulnerability · Published May 9, 2023 · Assigned by AMD
CVE-2021-26356
High 7.4
In plain English
A high-severity security flaw in 1st Gen AMD EPYC™ Processors from AMD. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities).
Severity (CVSS 3.1)7.4High
Exploit odds (30 days)0.4%top 65.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| AMD | Ryzen™ 3000 Series Desktop Processors “Matisse” AM4 | various |
| AMD | AMD Ryzen™ 5000 Series Desktop Processors “Vermeer” AM4 | various |
| AMD | 3rd Gen AMD Ryzen™ Threadripper™ Processors “Castle Peak” HEDT | various |
| AMD | Ryzen™ Threadripper™ PRO Processors “Castle Peak” WS | various |
| AMD | Ryzen™ Threadripper™ PRO Processors “Chagall” WS | various |
| AMD | 1st Gen AMD EPYC™ Processors | various |
| AMD | 2nd Gen AMD EPYC™ Processors | various |
| AMD | 3rd Gen AMD EPYC™ Processors | various |
Weakness: CWE-367 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N