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CVE record · CVE-2023-21819

Windows Secure Channel Denial of Service Vulnerability

CVSS 7.5 HighCriticalEPSS 0.31 · 98th percentile

Critical, because:

  • CVSS score 7.5 (7.0 or more) and EPSS 0.31 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the CVE Program (CNA: microsoft) at 14 Feb 2023, 19:33 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
Microsoft Windows 10 Version 1809
  • affected 10.0.17763.0 to before 10.0.17763.4010 custom
Microsoft Windows 10 Version 1809
  • affected 10.0.0 to before 10.0.17763.4010 custom
Microsoft Windows 10 Version 20H2
  • affected 10.0.0 to before 10.0.19042.2604 custom
Microsoft Windows 10 Version 21H2
  • affected 10.0.19043.0 to before 10.0.19044.2604 custom
Microsoft Windows 10 Version 22H2
  • affected 10.0.19045.0 to before 10.0.19045.2604 custom
Microsoft Windows 11 version 21H2
  • affected 10.0.0 to before 10.0.22621.1574 custom
Microsoft Windows Server 2019
  • affected 10.0.17763.0 to before 10.0.17763.4010 custom
Microsoft Windows Server 2019 (Server Core installation)
  • affected 10.0.17763.0 to before 10.0.17763.4010 custom
Microsoft Windows Server 2022
  • affected 10.0.20348.0 to before 10.0.20348.1547 custom
Identifiers
CVE-2023-21819
CNA
microsoft
Weakness (CWE)
CWE-125
Tags
Published
14 Feb 2023
Updated
19 Aug 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
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C CNA (microsoft)
  • CISA KEV Not listed.
  • EPSS 0.31, the 98th percentile, on 5 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 14 Feb 2023. 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.