CVE-2023-20540

LOW

Amd Ryzen™ 3000 Series Desktop Processors - Observable Timing Discrepancy

Title source: rule

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.

References (1)

Core 1

Core References

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

Scores

CVSS v4 1.8

EPSS 0.0011

EPSS Percentile 1.7%

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-208

Status published

Products (6)

AMD/AMD Ryzen™ 3000 Series Desktop Processors ComboAM4 1.0.0.E

AMD/AMD Ryzen™ 3000 Series Desktop Processors ComboAM4v2PI 1.2.0.CA

AMD/AMD Ryzen™ 5000 Series Desktop Processors ComboAM4v2PI 1.2.0.CA

AMD/AMD Ryzen™ Threadripper™ 3000 Series Processors CastlePeakPI-SP3r3 1.0.0.C

AMD/AMD Ryzen™ Threadripper™ PRO 3000WX Series Processors CastlePeakWSPI-sWRX8 1.0.0.E

AMD/AMD Ryzen™ Threadripper™ PRO 5000 WX-Series Processors ChagallWSPI-sWRX8 1.0.0.9

Published Jun 26, 2026

Tracked Since Jun 26, 2026