Vulnerability · Published Jun 26, 2026 · Assigned by AMD
CVE-2023-20540
Low 1.8
In plain English
A low-severity security flaw in AMD Ryzen™ 3000 Series Desktop 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 0.2% (higher than 4% of all known vulnerabilities).
Severity (CVSS 4.0)1.8Low
Exploit odds (30 days)0.2%top 95.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
An observable timing discrepancy in the ASP could allow a privileged attacker to perform a brute-force attack against the hash message authentication code, allowing arbitrary message input, potentially leading to a loss of data integrity.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| AMD | AMD Ryzen™ 3000 Series Desktop Processors | see references |
| AMD | AMD Ryzen™ 5000 Series Desktop Processors | see references |
| AMD | AMD Ryzen™ Threadripper™ 3000 Series Processors | see references |
| AMD | AMD Ryzen™ Threadripper™ PRO 3000WX Series Processors | see references |
| AMD | AMD Ryzen™ Threadripper™ PRO 5000 WX-Series Processors | see references |
Weakness: CWE-208 · Vector: CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N