High 7.5Published Oct 13, 2026

CVE-2026-83516Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability

Updated under an hour ago (Oct 27, 2026, 6:00 PM ET)

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It affects Microsoft Windows 10 Version 1809 and 7 other products. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 1.36%, higher than 71% of scored CVEs.

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Every CVE for Microsoft Windows 10 Version 1809

Exploited in the last 30 days

Out-of-bounds read in Windows Local Security Authority Subsystem Service (LSASS) allows an unauthorized attacker to deny service over a network.

CVSS: 7.5 HIGH (v3.1, CNA)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
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 1.36% (percentile 71)
Assigned by: microsoft
NVD analysis: Awaiting Analysis
Record last updated: Oct 27, 2026
First seen by InfoSec Signals: Oct 13, 2026

Affected products

Affected products

Microsoft Windows 10 Version 1809 microsoft:windows_10_1809	from 10.0.17763.0 before 10.0.17763.9376	CNA record
Microsoft Windows 11 Version 24H2 microsoft:windows_11_24h2	from 10.0.26100.0 before 10.0.26100.9711	CNA record
Microsoft Windows 11 Version 25H2 microsoft:windows_11_25h2	from 10.0.26200.0 before 10.0.26200.9711	CNA record
Microsoft Windows 11 version 26H1 microsoft:windows_11_26h1	from 10.0.28000.0 before 10.0.28000.3231	CNA record
Microsoft Windows 11 Version 26H2 microsoft:windows_11_26h2	from 10.0.26300.0 before 10.0.26300.9711	CNA record
Microsoft Windows Server 2019 microsoft:windows_server_2019 (from the name)	from 10.0.17763.0 before 10.0.17763.9376	CNA record
Microsoft Windows Server 2022 microsoft:windows_server_2022 (from the name)	from 10.0.20348.0 before 10.0.20348.5761	CNA record
Microsoft Windows Server 2025 microsoft:windows_server_2025 (from the name)	from 10.0.26100.0 before 10.0.26100.33650	CNA record

References

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83516	vendor-advisory, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.