CVE-2023-23409: Client Server Run-Time Subsystem (CSRSS) Information Disclosure Vulnerability

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-03-14 · updated 2026-06-17
Weakness: CWE-20

Description

Client Server Run-Time Subsystem (CSRSS) Information Disclosure Vulnerability

Affected products

Microsoft Windows 10 Version 1507: before 10.0.10240.19805 — fixed in 10.0.10240.19805
Microsoft Windows 10 1607: before 10.0.14393.5786 — fixed in 10.0.14393.5786
Microsoft Windows 10: before 10.0.17763.4131 — fixed in 10.0.17763.4131
Microsoft Windows 10 20H2: before 10.0.19042.2728 — fixed in 10.0.19042.2728
Microsoft Windows 10: before 10.0.19044.2728 — fixed in 10.0.19044.2728
Microsoft Windows 10: before 10.0.19045.2728 — fixed in 10.0.19045.2728
Microsoft Windows 11 21H2: before 10.0.22000.1696 — fixed in 10.0.22000.1696
Microsoft Windows 11: before 10.0.22000.1413 — fixed in 10.0.22000.1413
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 10.0.10240.19805 — fixed in 10.0.10240.19805
Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.5786 — fixed in 10.0.14393.5786
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.4131 — fixed in 10.0.17763.4131
Microsoft Windows 10 20H2: from 10.0.0 before 10.0.19042.2728 — fixed in 10.0.19042.2728
Microsoft Windows 10: from 10.0.19043.0 before 10.0.19044.2728 — fixed in 10.0.19044.2728
Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.2728 — fixed in 10.0.19045.2728
Microsoft Windows 11 21H2: from 10.0.0 before 10.0.22000.1696 — fixed in 10.0.22000.1696
Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.1413 — fixed in 10.0.22621.1413
Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0 before 6.1.7601.26415 — fixed in 6.1.7601.26415
Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0 before 6.0.6003.21966 — fixed in 6.0.6003.21966
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.24168 — fixed in 6.2.9200.24168
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.20865 — fixed in 6.3.9600.20865
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.5786 — fixed in 10.0.14393.5786
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.4131 — fixed in 10.0.17763.4131
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.1607 — fixed in 10.0.20348.1607

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.19805; Microsoft Windows 10 1607 10.0.14393.5786; Microsoft Windows 10 10.0.17763.4131; Microsoft Windows 10 20H2 10.0.19042.2728; Microsoft Windows 10 10.0.19044.2728; Microsoft Windows 10 10.0.19045.2728; Microsoft Windows 11 21H2 10.0.22000.1696; Microsoft Windows 11 10.0.22000.1413; Microsoft Windows 10 Version 1507 10.0.10240.19805; Microsoft Windows 10 1607 10.0.14393.5786; Microsoft Windows 10 10.0.17763.4131; Microsoft Windows 10 20H2 10.0.19042.2728. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2023-23409 or the next vulnerability affects your stack