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CVE record · CVE-2023-20540

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, potential…

CVSS 1.8 LowEPSS 0.0015 · 4th percentile

Published by the CVE Program (CNA: AMD) at 26 Jun 2026, 15:44 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
AMD AMD Ryzen™ 3000 Series Desktop Processors
  • unaffected ComboAM4 1.0.0.E
  • unaffected ComboAM4v2PI 1.2.0.CA
Other versions: affected
AMD AMD Ryzen™ 5000 Series Desktop Processors
  • unaffected ComboAM4v2PI 1.2.0.CA
Other versions: affected
AMD AMD Ryzen™ Threadripper™ 3000 Series Processors
  • unaffected CastlePeakPI-SP3r3 1.0.0.C
Other versions: affected
AMD AMD Ryzen™ Threadripper™ PRO 3000WX Series Processors
  • unaffected CastlePeakWSPI-sWRX8 1.0.0.E
Other versions: affected
AMD AMD Ryzen™ Threadripper™ PRO 5000 WX-Series Processors
  • unaffected ChagallWSPI-sWRX8 1.0.0.9
Other versions: affected
Identifiers
CVE-2023-20540
CNA
AMD
Weakness (CWE)
CWE-208
Tags
Published
26 Jun 2026
Updated
26 Jun 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
1.8 Low 4.0 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 CNA (AMD)
  • CISA KEV Not listed.
  • EPSS 0.0015, the 4th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 26 Jun 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.