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CVE-2026-65791: Windows iSCSI Target Service Remote Code Execution Vulnerability

criticalCVSS 9.8CVE-2026-65791
Heap-based buffer overflow in Windows iSCSI Target Service allows an unauthorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoftproduct: Windows iSCSI Target ServiceRemote code execution
What
A heap-based buffer overflow in Windows iSCSI Target Service enables remote code execution over the network.
Who is affected
Any system running Windows iSCSI Target Service exposed to untrusted network connections.
Urgency
Critical priority; network-exploitable RCE with high severity requires immediate remediation.
Action
Apply Windows updates addressing CVE-2026-65791 immediately or isolate affected systems.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
critical — CVSS 9.8
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65791

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-65791coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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