CVE-2026-65681Network attack vector

Service interruption via null pointer dereference

Published Aug 11, 2026 · Updated Aug 25, 2026

Null pointer dereference in Microsoft Windows iSCSI Target Service allows remote attackers to interrupt the service over a network. The service dereferences a null pointer while processing undisclosed network input; Microsoft has not identified the request or code path. No privileges or user interaction are required, and successful exploitation interrupts availability without reported data exposure or modification.

CVSS severity7.5
High
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in Microsoft Windows iSCSI Target Service allows remote attackers to interrupt the service over a network. The service dereferences a null pointer while processing undisclosed network input; Microsoft has not identified the request or code path. No privileges or user interaction are required, and successful exploitation interrupts availability without reported data exposure or modification.

The record

CVE
CVE-2026-65681
Published
Aug 11, 2026
Updated
Aug 25, 2026
Vendor
Microsoft
Product
Windows Server 2019
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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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 <10.0.17763.9121

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.9121
Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.33296
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.9418
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.9418
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.9121
Microsoft · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.9418
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.5499
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.33296
Microsoft · Windows 10 Version 1809version=10.0.17763.0 <10.0.17763.9121

Published CVSS scores

7.5MicrosoftCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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