CVE-2026-70031: Windows iSCSI Denial of Service Vulnerability
Heap-based buffer overflow in Windows iSCSI allows an unauthorized attacker to deny service over a network.
Other sources
Windows iSCSI Denial of Service Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
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Fixed in 6.2.9200.26434Patch KB5126835 - Upgrade
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Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
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Fixed in 10.0.17763.9376Patch KB5126651 - Upgrade
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Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.7652Patch KB5126653 - Upgrade
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Fixed in 10.0.19044.7807Patch KB5126657 - Upgrade
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Fixed in 10.0.26100.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26300.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.9612Patch KB5126868 - Upgrade
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Fixed in 6.3.9600.23470Patch KB5126836
Event History
Frequently Asked Questions
Which systems should be prioritized for assessment?
Assess Microsoft Windows 10, Windows 11, and Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025 systems that use Windows iSCSI.
What access does an attacker need to trigger the issue?
The vulnerability is reachable over the network and requires no privileges or user interaction. An unauthorized attacker can exploit it with low attack complexity.
What is the expected security impact?
The reported impact is denial of service. The CVSS vector indicates high availability impact, with no reported confidentiality or integrity impact.