---
id: "CVE-2017-8759"
kind: "vulnerability"
aliases: ["CVE-2017-8759"]
title: "Microsoft .NET Framework: Microsoft .NET Framework Remote Code Execution Vulnerability"
severity: "critical"
cvss: 9.3
epss: 0.88698
exploited: true
status: "open"
category: "runtime"
products: [{"name": "Microsoft .NET Framework", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["dotnet", "exploited", "microsoft-office", "runtime", "windows"]
not_affected_if: ["patched-systems"]
published_at: "2017-09-13T01:29:12+00:00"
first_seen_at: "2026-10-23T19:11:53+00:00"
updated_at: "2026-10-23T21:57:34+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2017-8759", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2017-8759", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-8759", "first_seen_at": "2026-10-23T21:57:34+00:00"}]
---

# Microsoft .NET Framework: Microsoft .NET Framework Remote Code Execution Vulnerability

Microsoft .NET Framework mishandles untrusted input, allowing remote code execution. An attacker who sends a crafted document or request can take control of the affected Windows system.

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

## Affected

- vendor:Microsoft .NET Framework affected ? fixed ?

## Fix

Apply the Microsoft security update for .NET Framework per vendor instructions, as directed by CISA KEV.

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2017-8759
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2017-8759
- 2026-10-23T21:57:34+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2017-8759

## From the sources

Microsoft .NET Framework contains a remote code execution vulnerability when processing untrusted input that could allow an attacker to take control of an affected system.

CISA required action: Apply updates per vendor instructions.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_