---
id: "CVE-2017-11774"
kind: "vulnerability"
aliases: ["CVE-2017-11774"]
title: "Microsoft Office: Microsoft Office Outlook Security Feature Bypass Vulnerability"
severity: "high"
cvss: 7.8
epss: 0.59627
exploited: true
status: "open"
category: "vendor"
products: [{"name": "Microsoft Office", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "microsoft-office", "outlook", "vendor", "windows"]
not_affected_if: ["unpatched-builds-only"]
published_at: "2017-10-13T13:29:00+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-2017-11774", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2017-11774", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-11774", "first_seen_at": "2026-10-23T21:57:34+00:00"}]
---

# Microsoft Office: Microsoft Office Outlook Security Feature Bypass Vulnerability

Microsoft Office Outlook mishandles objects in memory, which lets an attacker bypass a security feature. Successful exploitation allows the attacker to execute commands on the victim's machine.

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

## Affected

- vendor:Microsoft Office affected ? fixed ?

## Fix

Apply the Microsoft updates for Office Outlook per vendor instructions (CISA required action); the specific patched build is unknown from the sources.

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2017-11774
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2017-11774
- 2026-10-23T21:57:34+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2017-11774

## From the sources

Microsoft Office Outlook contains a security feature bypass vulnerability due to improperly handling objects in memory. Successful exploitation allows an attacker to execute commands.

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_