---
id: "CVE-2015-1770"
kind: "vulnerability"
aliases: ["CVE-2015-1770"]
title: "Microsoft Office: Microsoft Office Uninitialized Memory Use Vulnerability"
severity: "critical"
cvss: 9.3
epss: 0.34995
exploited: true
status: "open"
category: "other"
products: [{"name": "Microsoft Office", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "microsoft-office", "other", "windows"]
not_affected_if: ["unknown"]
published_at: "2015-06-10T01:59:36+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-2015-1770", "first_seen_at": "2026-10-23T19:11:52+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2015-1770", "first_seen_at": "2026-10-23T19:13:45+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2015-1770", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# Microsoft Office: Microsoft Office Uninitialized Memory Use Vulnerability

Microsoft Office has an uninitialized memory use flaw that lets a remote attacker run arbitrary code by sending a crafted Office document. CISA lists it as actively exploited in the wild.

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

## Affected

- vendor:Microsoft Office affected ? fixed ?

## Fix

Apply the Microsoft Office updates per vendor instructions; the specific patch or fixed build is not stated in the sources.

## Timeline

- 2026-10-23T19:11:52+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2015-1770
- 2026-10-23T19:13:45+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2015-1770
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2015-1770

## From the sources

Microsoft Office 2013 SP1 and 2013 RT SP1 allows remote attackers to execute arbitrary code via a crafted Office document, aka "Microsoft Office Uninitialized Memory Use 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_