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CVE-2023-21803: Windows iSCSI Discovery Service Remote Code Execution Vulnerability

• Severity: critical (CVSS 9.8 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: 2023-02-14 · updated 2026-08-19
• Weakness: CWE-190

Description

Windows iSCSI Discovery Service Remote Code Execution Vulnerability

Affected products

• Microsoft Windows 10 Version 1607: before 10.0.10240.19747 — fixed in 10.0.10240.19747
• Microsoft Windows 10 1607: before 10.0.14393.5717 — fixed in 10.0.14393.5717
• Microsoft Windows 10: before 10.0.17763.4010 — fixed in 10.0.17763.4010
• Microsoft Windows 10 20H2: before 10.0.19042.2604 — fixed in 10.0.19042.2604
• Microsoft Windows 10: before 10.0.19044.2604 — fixed in 10.0.19044.2604
• Microsoft Windows 10: before 10.0.19045.2604 — fixed in 10.0.19045.2604
• Microsoft Windows Server 2008: all versions
• Microsoft Windows 10 Version 1507: from 10.0.10240.0 before 10.0.10240.19747 — fixed in 10.0.10240.19747
• Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.5717 — fixed in 10.0.14393.5717
• Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.4010 — fixed in 10.0.17763.4010
• Microsoft Windows 10 20H2: from 10.0.0 before 10.0.19042.2604 — fixed in 10.0.19042.2604
• Microsoft Windows 10: from 10.0.19043.0 before 10.0.19044.2604 — fixed in 10.0.19044.2604
• Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.2604 — fixed in 10.0.19045.2604
• Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0 before 6.0.6003.21915 — fixed in 6.0.6003.21915

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1607 10.0.10240.19747; Microsoft Windows 10 1607 10.0.14393.5717; Microsoft Windows 10 10.0.17763.4010; Microsoft Windows 10 20H2 10.0.19042.2604; Microsoft Windows 10 10.0.19044.2604; Microsoft Windows 10 10.0.19045.2604; Microsoft Windows 10 Version 1507 10.0.10240.19747; Microsoft Windows 10 1607 10.0.14393.5717; Microsoft Windows 10 10.0.17763.4010; Microsoft Windows 10 20H2 10.0.19042.2604; Microsoft Windows 10 10.0.19044.2604; Microsoft Windows 10 10.0.19045.2604. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21803
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21803

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