CVE-2023-20540

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Summary

CVECVE-2023-20540
StatePUBLISHED
AssignerAMD
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-26 16:16:28 UTC
Updated2026-06-26 17:16:30 UTC
DescriptionAn 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.

Risk And Classification

Primary CVSS: v4.0 1.8 LOW from [email protected]

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

Problem Types: CWE-208 | CWE-208 CWE-208 Observable timing discrepancy

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary1.8LOWCVSS: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/C...
4.0CNACVSS1.8LOWCVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Local
Attack Complexity
High
Attack Requirements
None
Privileges Required
High
User Interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA AMD AMD Ryzen 3000 Series Desktop Processors unaffected ComboAM4 1.0.0.E Not specified
CNA AMD AMD Ryzen 3000 Series Desktop Processors unaffected ComboAM4v2PI 1.2.0.CA Not specified
CNA AMD AMD Ryzen 5000 Series Desktop Processors unaffected ComboAM4v2PI 1.2.0.CA Not specified
CNA AMD AMD Ryzen Threadripper 3000 Series Processors unaffected CastlePeakPI-SP3r3 1.0.0.C Not specified
CNA AMD AMD Ryzen Threadripper PRO 3000WX Series Processors unaffected CastlePeakWSPI-sWRX8 1.0.0.E Not specified
CNA AMD AMD Ryzen Threadripper PRO 5000 WX-Series Processors unaffected ChagallWSPI-sWRX8 1.0.0.9 Not specified

References

ReferenceSourceLinkTags
www.amd.com/en/resources/product-security/bulletin/amd-sb-4012.html [email protected] www.amd.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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