---
id: "CVE-2017-0147"
kind: "vulnerability"
aliases: ["CVE-2017-0147"]
title: "Microsoft SMBv1 server: Microsoft Windows SMBv1 Information Disclosure Vulnerability"
severity: "high"
cvss: 7.5
epss: 0.99693
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Microsoft SMBv1 server", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "file-servers", "infrastructure", "ransomware", "smbv1", "windows"]
not_affected_if: ["no-smb-exposure", "smbv1-disabled"]
published_at: "2017-03-17T00:59:04+00:00"
first_seen_at: "2026-10-23T19:11:52+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2017-0147", "first_seen_at": "2026-10-23T19:11:52+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2017-0147", "first_seen_at": "2026-10-23T19:13:45+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-0147", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# Microsoft SMBv1 server: Microsoft Windows SMBv1 Information Disclosure Vulnerability

The SMBv1 server in Microsoft Windows leaks bytes from process memory when it receives a specially crafted network packet. An attacker who can reach the SMB port can read sensitive information from the server's memory without logging in.

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

## Affected

- vendor:Microsoft SMBv1 server affected ? fixed ?

## Fix

Apply the Microsoft update for this CVE per vendor instructions; the sources do not name the exact KB or build. Disable SMBv1 on Windows systems if it is not required.

## Timeline

- 2026-10-23T19:11:52+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2017-0147
- 2026-10-23T19:13:45+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2017-0147
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2017-0147

## From the sources

The SMBv1 server in Microsoft Windows Vista SP2; Windows Server 2008 SP2 and R2 SP1; Windows 7 SP1; Windows 8.1; Windows Server 2012 Gold and R2; Windows RT 8.1; and Windows 10 Gold, 1511, and 1607; and Windows Server 2016 allows remote attackers to obtain sensitive information from process memory via a crafted packets, aka "Windows SMB Information Disclosure Vulnerability."

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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_