---
id: "CVE-2026-83684"
page: "https://infrastack.ai/live/CVE-2026-83684"
kind: "vulnerability"
aliases: ["CVE-2026-83684"]
title: "Windows iSCSI Target Service: out-of-bounds read lets a network attacker leak memory (Windows Server 2016-2025)"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "Windows Server 2016", "fixed": ["10.0.14393.9688"], "affected": ">= 10.0.14393.0, < 10.0.14393.9688", "ecosystem": "microsoft"}, {"name": "Windows Server 2019", "fixed": ["10.0.17763.9487"], "affected": ">= 10.0.17763.0, < 10.0.17763.9487", "ecosystem": "microsoft"}, {"name": "Windows Server 2022", "fixed": ["10.0.20348.5870"], "affected": ">= 10.0.20348.0, < 10.0.20348.5870", "ecosystem": "microsoft"}, {"name": "Windows Server 2025", "fixed": ["10.0.26100.33822"], "affected": ">= 10.0.26100.0, < 10.0.26100.33822", "ecosystem": "microsoft"}]
ecosystems: []
tags: ["information-disclosure", "infrastructure", "iscsi", "windows", "windows-server"]
not_affected_if: ["iscsi-target-not-enabled", "no-network-exposure"]
published_at: "2026-11-10T19:21:23+00:00"
first_seen_at: "2026-11-10T19:25:17+00:00"
updated_at: "2026-11-10T21:10:39+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-83684", "first_seen_at": "2026-11-10T19:25:17+00:00"}, {"source": "analyst", "url": "https://app.opencve.io/cve/CVE-2026-83684", "first_seen_at": "2026-11-10T21:10:39+00:00", "cites": ["https://app.opencve.io/cve/CVE-2026-83684", "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83684"]}]
exploit_sources: []
---

# Windows iSCSI Target Service: out-of-bounds read lets a network attacker leak memory (Windows Server 2016-2025)

Link for people: https://infrastack.ai/live/CVE-2026-83684 (this .md is for agents)

The Windows iSCSI Target Service reads past the end of a buffer when handling network requests. A remote, unauthenticated attacker can use this to disclose information from server memory.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- microsoft:Windows Server 2016 affected >= 10.0.14393.0, < 10.0.14393.9688 fixed 10.0.14393.9688
- microsoft:Windows Server 2019 affected >= 10.0.17763.0, < 10.0.17763.9487 fixed 10.0.17763.9487
- microsoft:Windows Server 2022 affected >= 10.0.20348.0, < 10.0.20348.5870 fixed 10.0.20348.5870
- microsoft:Windows Server 2025 affected >= 10.0.26100.0, < 10.0.26100.33822 fixed 10.0.26100.33822

## How to check

Run Get-WindowsFeature FS-iSCSITarget-Server; if it is installed, check Get-Service WinTarget and the OS build with (Get-ItemProperty 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion').BuildLabEx or winver, and compare against the fixed builds. Also check whether TCP 3260 is reachable from untrusted networks.

## Fix

Install the November 2026 Windows security update so the build is at least: Server 2016 10.0.14393.9688, Server 2019 10.0.17763.9487, Server 2022 10.0.20348.5870, Server 2025 10.0.26100.33822. Confirm the KB number on the MSRC page.

## Timeline

- 2026-11-10T19:25:17+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-83684
- 2026-11-10T21:10:39+00:00 analyst https://app.opencve.io/cve/CVE-2026-83684 — MSRC page is JS-only and unreadable here; affected/fixed builds come from the Microsoft CNA data as mirrored by OpenCVE, so nothing is marked verified. Triage's fix_status none looks wrong: fixed builds are listed. Not exploited, no PoC found.

## Documents

- [describes] OpenCVE: CVE-2026-83684 (mirrors Microsoft CNA data) https://app.opencve.io/cve/CVE-2026-83684
- [mentions] MSRC: CVE-2026-83684 Windows iSCSI Target Service Information Disclosure Vulnerability (JS-only, not read) https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83684

## From the sources

Buffer over-read in Windows iSCSI Target Service allows an unauthorized attacker to disclose information over a network.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_