Windows Secure Channel Denial of Service Vulnerability

published 2023-02-14 3 y ago modified 2026-08-19 2 mo ago also EUVD-2023-25985

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 30.8%; EPSS 30.8% chance of exploitation in 30 days, percentile 98%
public exploits: 0; none known

Patch / fix

fixed in 8 links 1

Microsoft Windows 10 Version 1809 10.0.17763.4010
Microsoft Windows 10 Version 20H2 10.0.19042.2604
Microsoft Windows 10 Version 21H2 10.0.19044.2604
Microsoft Windows 10 Version 22H2 10.0.19045.2604
Microsoft Windows 11 version 21H2 10.0.22621.1574
Microsoft Windows Server 2019 10.0.17763.4010
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.4010
Microsoft Windows Server 2022 10.0.20348.1547

msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21819 advisory

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 2 y ago (2024-10-04)

Exploit prediction

30.81% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	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	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Microsoft Windows 10 Version 1809
Microsoft Windows 10 Version 20H2
Microsoft Windows 10 Version 21H2
Microsoft Windows 10 Version 22H2
Microsoft Windows 11 version 21H2
Microsoft Windows Server 2019
Microsoft Windows Server 2019 (Server Core installation)
Microsoft Windows Server 2022

Classification

Weakness

CWE-125 Out-of-bounds Read

References

msrc.microsoft.com /update-guide/vulnerability/CVE-2023-21819
vendor-advisory, patch

Sources

CVE List CVE-2023-21819
NVD CVE-2023-21819

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary