# CVE-2026-71343 — Microsoft Windows 10 Version 1607

> As of 2026-10-08, CVE-2026-71343 is a HIGH-severity vulnerability in Microsoft Windows 10 Version 1607, CVSS v3.1 7.8, EPSS 0.3% (24.5th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-71343, most recently “Microsoft September 2026 Patch Tuesday — 999 CVEs, 3 actively exploited zero-days (CVE-2026-85880, CVE-2026-81963, CVE-2026-85046)”.

**Last updated:** 2026-10-08

## What is CVE-2026-71343?

Heap-based buffer overflow in Windows Remote Access Connection Manager allows an authorized attacker to execute code locally.

The record classifies CVE-2026-71343 under weakness class [CWE-122](https://intel.threadlinqs.com/cwe/CWE-122). Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 12 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 44 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.8 — HIGH (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 24.5% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-08, last modified 2026-10-08

## Is CVE-2026-71343 being exploited?

It currently carries a trending score of 33 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Microsoft](https://intel.threadlinqs.com/vendors/microsoft): Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2

## How to fix CVE-2026-71343

No vendor patch reference has been recorded for CVE-2026-71343 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-71343

1 tracked threat in the Threadlinqs corpus references CVE-2026-71343, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Microsoft September 2026 Patch Tuesday — 999 CVEs, 3 actively exploited zero-days (CVE-2026-85880, CVE-2026-81963, CVE-2026-85046)](https://intel.threadlinqs.com/threat/TL-2026-2407) — CRITICAL · 2026-09-08

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-10-10.

**Vendor advisory and patch**

- [msrc.microsoft.com — vendor advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-71343)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-71343
Full detection coverage and IOCs for threats exploiting CVE-2026-71343 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp