What’s Vulnerable › Vulnerabilities

CVE-2023-20540

• Severity: low (CVSS 1.8 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-26 · updated 2026-06-26
• Weakness: CWE-208

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

• AMD Ryzen™ 3000 Series Desktop Processors: all versions
• AMD Ryzen™ 5000 Series Desktop Processors: all versions
• AMD Ryzen™ Threadripper™ 3000 Series Processors: all versions
• AMD Ryzen™ Threadripper™ PRO 3000WX Series Processors: all versions
• AMD Ryzen™ Threadripper™ PRO 5000 WX-Series Processors: all versions

References

• https://www.amd.com/en/resources/product-security/bulletin/amd-sb-4012.html

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