---
id: "CVE-2018-4344"
kind: "vulnerability"
aliases: ["CVE-2018-4344"]
title: "A memory corruption issue was addressed with improved memory handling"
severity: "critical"
cvss: 9.3
epss: 0.02374
exploited: true
status: "open"
category: "vendor"
products: [{"name": "Apple Multiple Products", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "apple iphone os", "fixed": ["12.0"], "affected": "< 12.0", "ecosystem": "vendor"}, {"name": "apple mac os x", "fixed": ["10.14"], "affected": "< 10.14", "ecosystem": "vendor"}, {"name": "apple tvos", "fixed": ["12.0"], "affected": "< 12.0", "ecosystem": "vendor"}, {"name": "apple watchos", "fixed": ["5.0"], "affected": "< 5.0", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["apple-devices", "exploited", "ios", "macos", "tvos", "vendor", "watchos"]
not_affected_if: ["fully-patched-devices"]
published_at: "2019-04-03T18:29:09+00:00"
first_seen_at: "2026-10-23T19:11:52+00:00"
updated_at: "2026-10-23T22:29:04+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-4344", "first_seen_at": "2026-10-23T19:11:52+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2018-4344", "first_seen_at": "2026-10-23T19:13:45+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-4344", "first_seen_at": "2026-10-23T22:29:04+00:00"}]
---

# A memory corruption issue was addressed with improved memory handling

Apple iOS, macOS, tvOS and watchOS contain a memory corruption flaw in a component the sources do not name. An attacker who triggers it can run code on the affected device.

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

## Affected

- vendor:Apple Multiple Products affected ? fixed ?
- vendor:apple iphone os affected < 12.0 fixed 12.0
- vendor:apple mac os x affected < 10.14 fixed 10.14
- vendor:apple tvos affected < 12.0 fixed 12.0
- vendor:apple watchos affected < 5.0 fixed 5.0

## How to check

Check the installed OS version on each Apple device (Settings > General > About on iOS, Apple menu > About This Mac on macOS) and compare it to the patched releases in Apple's security notes.

## Fix

Update iOS, macOS, tvOS and watchOS to the current release from Apple, as CISA's required action directs.

## Timeline

- 2026-10-23T19:11:52+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-4344
- 2026-10-23T19:13:45+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2018-4344
- 2026-10-23T22:29:04+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2018-4344

## From the sources

Apple iOS, macOS, tvOS, and watchOS contain a memory corruption vulnerability which can allow for code execution.

CISA required action: Apply updates per vendor instructions.

---

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