Review reviewHigh

CVE-2026-62784

Microsoft Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2

Heap-based buffer overflow in Microsoft Local Security Authority Server (lsasrv) allows an authorized attacker to execute code over a network.

PRIORITY ASSESSMENT

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability-

Technical severityCVSS 8.8

Heap-based buffer overflow in Microsoft Local Security Authority Server (lsasrv) allows an authorized attacker to execute code over a network.

Product: Microsoft Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2
Affected versions: >= 10.0.14393.0 < 10.0.14393.9418, >= 10.0.17763.0 < 10.0.17763.9121, >= 10.0.19044.0 < 10.0.19044.7663, >= 10.0.19045.0 < 10.0.19045.7663, >= 10.0.22631.0 < 10.0.22631.7517, >= 10.0.26100.0 < 10.0.26100.9168, >= 10.0.26200.0 < 10.0.26200.9168, >= 10.0.28000.0 < 10.0.28000.2704, >= 6.2.9200.0 < 6.2.9200.26280, >= 6.3.9600.0 < 6.3.9600.23338, >= 10.0.20348.0 < 10.0.20348.5499, >= 10.0.26100.0 < 10.0.26100.33296, < 10.0.17763.9115, < 10.0.26100.9106, < 10.0.26200.9106
Fixed versions: 10.0.14393.9418, 10.0.17763.9115, 10.0.19044.7663, 10.0.19045.7663, 10.0.22631.7517, 10.0.26100.9106, 10.0.26200.9106, 10.0.28000.2704, 10.0.20348.5440, 10.0.26100.33222

Confirm exposure before applying a vendor-supported change.

1
Identify
Confirm that Microsoft Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.