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CVE-2026-69598

Microsoft Windows 10 21h2 vulnerability

8.8 HIGHEPSS 0.82%
  1. Published8 Sept 2026

Description

Incorrect calculation of buffer size in Windows iSCSI allows an unauthorized attacker to execute code over a network.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Microsoft Windows 10 1607< 10.0.14393.9512
Microsoft Windows 10 1809< 10.0.17763.9245
Microsoft Windows 10 21h2< 10.0.19044.7725
Microsoft Windows 10 22h2< 10.0.19045.7725
Microsoft Windows 11 23h2< 10.0.22631.7582
Microsoft Windows 11 24h2< 10.0.26100.9445
Microsoft Windows 11 25h2< 10.0.26200.9445
Microsoft Windows 11 26h1< 10.0.28000.2954
Microsoft Windows Server 2012r2
Microsoft Windows Server 2016< 10.0.14393.9512
Microsoft Windows Server 2019< 10.0.17763.9245
Microsoft Windows Server 2022< 10.0.20348.5622
Microsoft Windows Server 2025< 10.0.26100.33438

Remediation

Fixed in
Microsoft Windows 10 1607≥ 10.0.14393.9512
Microsoft Windows 10 1809≥ 10.0.17763.9245
Microsoft Windows 10 21h2≥ 10.0.19044.7725
Microsoft Windows 10 22h2≥ 10.0.19045.7725
Microsoft Windows 11 23h2≥ 10.0.22631.7582
Microsoft Windows 11 24h2≥ 10.0.26100.9445
Microsoft Windows 11 25h2≥ 10.0.26200.9445
Microsoft Windows 11 26h1≥ 10.0.28000.2954
Microsoft Windows Server 2016≥ 10.0.14393.9512
Microsoft Windows Server 2019≥ 10.0.17763.9245

References

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Frequently asked

Is CVE-2026-69598 being actively exploited?

CVE-2026-69598 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.82%.

How severe is CVE-2026-69598?

CVE-2026-69598 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.82% probability of exploitation.

Which products are affected by CVE-2026-69598?

Affected products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, and 8 more.

How do I fix CVE-2026-69598?

Upgrade affected software to a fixed version, for example Microsoft Windows 10 1607 10.0.14393.9512, Microsoft Windows 10 1809 10.0.17763.9245, Microsoft Windows 10 21h2 10.0.19044.7725 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-69598 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.