CVE-2023-32084: HTTP.sys Denial of Service Vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-07-11 · updated 2026-06-17
Weakness: CWE-476

Description

HTTP.sys Denial of Service Vulnerability

Affected products

Microsoft Windows 10: before 10.0.17763.4645 — fixed in 10.0.17763.4645
Microsoft Windows 11 21H2: before 10.0.22000.2176 — fixed in 10.0.22000.2176
Microsoft Windows 11: before 10.0.22621.1992 — fixed in 10.0.22621.1992
Microsoft Windows Server 2019: all versions
Microsoft Windows Server 2022: all versions
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.4645 — fixed in 10.0.17763.4645
Microsoft Windows 11 21H2: from 10.0.0 before 10.0.22000.2176 — fixed in 10.0.22000.2176
Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.1992 — fixed in 10.0.22621.1992
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.4645 — fixed in 10.0.17763.4645
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.1850 — fixed in 10.0.20348.1850

How to fix

Upgrade to a fixed version: Microsoft Windows 10 10.0.17763.4645; Microsoft Windows 11 21H2 10.0.22000.2176; Microsoft Windows 11 10.0.22621.1992; Microsoft Windows 10 10.0.17763.4645; Microsoft Windows 11 21H2 10.0.22000.2176; Microsoft Windows 11 10.0.22621.1992; Microsoft Windows Server 2019 10.0.17763.4645; Microsoft Windows Server 2022 10.0.20348.1850. Check the vendor advisory for mitigations.

References

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