CVE-2026-69521Network attack vector

Unauthenticated code execution via integer overflow

Published Oct 13, 2026 · Updated Oct 13, 2026

Integer overflow in Microsoft Windows iSCSI allows remote attackers to execute code over a network without authentication. Microsoft identifies integer overflow or wraparound but does not disclose the affected arithmetic operation or how untrusted input reaches it. Exploitation requires user interaction, whose form is unspecified in the published record.

CVSS severityUnavailable
Unscored
EPSS probability0.66%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Microsoft Windows iSCSI allows remote attackers to execute code over a network without authentication. Microsoft identifies integer overflow or wraparound but does not disclose the affected arithmetic operation or how untrusted input reaches it. Exploitation requires user interaction, whose form is unspecified in the published record.

The record

CVE
CVE-2026-69521
Published
Oct 13, 2026
Updated
Oct 13, 2026
Vendor
Microsoft Corporation
Product
Windows Server 2019
Classifications
CWE-190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.17763.0 <10.0.17763.9245

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft Corporation · Windows Server 2019version=10.0.17763.0 <10.0.17763.9245
Microsoft Corporation · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.33438
Microsoft Corporation · Windows 11, version 25H2version=10.0.26200.0 <10.0.26200.9445
Microsoft Corporation · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.9512
Microsoft Corporation · Windows 11, version 24H2version=10.0.26100.0 <10.0.26100.9445
Microsoft Corporation · Windows Server 2012 (Server Core installation)version=6.2.9200.0 <6.2.9200.26349
Microsoft Corporation · Windows Server 2012version=6.2.9200.0 <6.2.9200.26349
Microsoft Corporation · Windows 10 Version 21H2version=10.0.19044.0 <10.0.19044.7725
Microsoft Corporation · Windows Server 2016version=10.0.14393.0 <10.0.14393.9512
Microsoft Corporation · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.7725
Microsoft Corporation · Windows Server 2012 R2 (Server Core installation)version=6.3.9600.0 <6.3.9600.23398
Microsoft Corporation · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.9245
Microsoft Corporation · Windows 11, version 26H1version=10.0.28000.0 <10.0.28000.2954
Microsoft Corporation · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.7582
Microsoft Corporation · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.9512
Microsoft Corporation · Windows Server 2022version=10.0.20348.0 <10.0.20348.5622
Microsoft Corporation · Windows Server 2025version=10.0.26100.0 <10.0.26100.33438
Microsoft Corporation · Windows 10 Version 1809version=10.0.17763.0 <10.0.17763.9245
Microsoft Corporation · Windows Server 2012 R2version=6.3.9600.0 <6.3.9600.23398

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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