CVE-2023-33166: Remote Procedure Call Runtime Denial of Service Vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.6% 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-126

Description

Remote Procedure Call Runtime Denial of Service Vulnerability

Affected products

Microsoft Windows 10 Version 1507: before 10.0.10240.20048 — fixed in 10.0.10240.20048
Microsoft Windows 10 1607: before 10.0.14393.6085 — fixed in 10.0.14393.6085
Microsoft Windows 10: before 10.0.17763.4645 — fixed in 10.0.17763.4645
Microsoft Windows 10: before 10.0.19041.3208 — fixed in 10.0.19041.3208
Microsoft Windows 10: before 10.0.19045.3208 — fixed in 10.0.19045.3208
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 2008: r2-sp1
Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: all versions
Microsoft Windows Server 2019: all versions
Microsoft Windows Server 2022: all versions
Microsoft Windows 10 Version 1507: from 10.0.10240.0 before 10.0.10240.20048 — fixed in 10.0.10240.20048
Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.6085 — fixed in 10.0.14393.6085
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.4645 — fixed in 10.0.17763.4645
Microsoft Windows 10: from 10.0.19043.0 before 10.0.19044.3208 — fixed in 10.0.19044.3208
Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.3208 — fixed in 10.0.19045.3208
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 2008 R2 Service Pack 1: from 6.1.7601.0 before 6.1.7601.26623 — fixed in 6.1.7601.26623
Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0 before 6.0.6003.22175 — fixed in 6.0.6003.22175
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.24374 — fixed in 6.2.9200.24374
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.21063 — fixed in 6.3.9600.21063
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.6085 — fixed in 10.0.14393.6085
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 Version 1507 10.0.10240.20048; Microsoft Windows 10 1607 10.0.14393.6085; Microsoft Windows 10 10.0.17763.4645; Microsoft Windows 10 10.0.19041.3208; Microsoft Windows 10 10.0.19045.3208; Microsoft Windows 11 21H2 10.0.22000.2176; Microsoft Windows 11 10.0.22621.1992; Microsoft Windows 10 Version 1507 10.0.10240.20048; Microsoft Windows 10 1607 10.0.14393.6085; Microsoft Windows 10 10.0.17763.4645; Microsoft Windows 10 10.0.19044.3208; Microsoft Windows 10 10.0.19045.3208. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2023-33166 or the next vulnerability affects your stack