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CVE-2026-65791

Windows iSCSI Target Service Remote Code Execution Vulnerability

Published: Aug 11, 2026Updated: Aug 16, 2026 Sources: CVE List NVDCWE-122
9.8CRITICAL
NVD MITRE
EPSS Score
0.6%
Top 54.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

Heap-based buffer overflow in Windows iSCSI Target Service allows an unauthorized attacker to execute code over a network.

In plain language

AI Act now

CVE-2026-65791 is a Windows iSCSI Target Service flaw that lets a remote attacker run code on vulnerable systems, so a typical business should treat it as urgent and patch if you run the iSCSI Target role.

Executive summary

CVE-2026-65791 is a Windows iSCSI Target Service remote code execution vulnerability (CWE-122) caused by a heap-based buffer overflow, enabling an unauthorized attacker to execute code over the network against affected Windows 10/Server versions that are vulnerable and reachable.

If affected, business impact
Full system takeoverData theft or ransomwareService disruptionCredential compromise risk

What to do now

  1. Identify whether you run the Windows iSCSI Target Service (iSCSI Target role) on Windows 10/Server systems.
  2. Check your OS version/build against the fixed versions listed by Microsoft for CVE-2026-65791.
  3. Install the Microsoft security update for CVE-2026-65791 on affected systems as soon as possible.
  4. If you can’t patch immediately, disable the iSCSI Target role/service and ensure the iSCSI Target endpoints are not reachable from untrusted networks.
Patch / advisory Usually a quick update

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-122

Affected Products

Microsoft
commercial·US
Windows 10 Version 1607On-premOS
Operating Systems / windows
Windows Server 2012 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2016 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2019 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2022On-premOS
Operating Systems / windows
Windows Server 2025 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2012 R2 (Server Core installation)On-premOS
Operating Systems / windows
and 13 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-65791?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65791
msrc.microsoft.com
News mentions
4

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