---
id: "CVE-2020-27950"
kind: "vulnerability"
aliases: ["CVE-2020-27950"]
title: "Apple Multiple Products: Apple Multiple Products Memory Initialization Vulnerability"
severity: "high"
cvss: 7.1
epss: 0.1652
exploited: true
status: "open"
category: "vendor"
products: [{"name": "Apple Multiple Products", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["apple-devices", "exploited", "ios", "ipados", "macos", "vendor", "watchos"]
not_affected_if: ["fully-patched-devices"]
published_at: "2020-12-08T21:15:13+00:00"
first_seen_at: "2026-10-23T19:11:53+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-2020-27950", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2020-27950", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-27950", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# Apple Multiple Products: Apple Multiple Products Memory Initialization Vulnerability

Apple iOS, iPadOS, macOS and watchOS have a memory initialization flaw that lets a malicious app read kernel memory. Reading kernel memory can leak data useful for escaping app sandboxes and defeating kernel protections.

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

## Affected

- vendor:Apple Multiple Products affected ? fixed ?

## How to check

Check the device OS version in Settings > General > About (iOS/iPadOS) or About This Mac (macOS) and compare it with the patched release listed in Apple's security notes.

## Fix

Update iOS, iPadOS, macOS and watchOS to the latest versions per Apple's vendor instructions.

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-27950
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2020-27950
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2020-27950

## From the sources

A memory initialization issue was addressed. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 5.3.9, macOS Catalina 10.15.7 Supplemental Update, macOS Catalina 10.15.7 Update. A malicious application may be able to disclose kernel memory.

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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_