# CVE-2021-1789: Apple Multiple Products Type Confusion Vulnerability

Source: https://junglewise.ai/threats/cve-2021-1789-apple-multiple-products-type-confusion-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-05-04. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2021-1789 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2022-05-04

A type confusion vulnerability in multiple Apple operating systems and Safari allows for arbitrary code execution when processing maliciously crafted web content. The issue was addressed through improved state handling.

Technologies: [Apple Multiple Products](https://junglewise.ai/threats/technologies/multiple-products). Vendors: [Apple](https://junglewise.ai/threats/vendors/apple).

## Quick answers

**Is CVE-2021-1789 exploited in the wild?** Yes. CVE-2021-1789 is known to be exploited in the wild, first recorded on 4 May 2022. Treat it as urgent.

**How severe is CVE-2021-1789?** Critical severity, with a CVSS score of 8.8, published 4 May 2022.

**Which products and versions are affected?** Apple macOS Big Sur Before 11.2; Apple macOS Catalina Before Security Update 2021-001; Apple macOS Mojave Before Security Update 2021-001; Apple tvOS Before 14.4; and 4 more.

**Is there a fix for CVE-2021-1789?** A patch was published on 2021-01-26: Initial vendor security updates released for iOS, iPadOS, and tvOS. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2021-1789 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2021-1789?** Check whether you run Apple Multiple Products. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Apple macOS Big Sur Before 11.2
- Apple macOS Catalina Before Security Update 2021-001
- Apple macOS Mojave Before Security Update 2021-001
- Apple tvOS Before 14.4
- Apple watchOS Before 7.3
- Apple iOS Before 14.4
- Apple iPadOS Before 14.4
- Apple Safari Before 14.0.3

## Timeline

- 2022-05-04: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2022-05-04: disclosed
- 2021-01-26: patched: Initial vendor security updates released for iOS, iPadOS, and tvOS.

## Related threats

- [Apple iOS, iPadOS, macOS, Safari, tvOS, watchOS pointer authentication bypass](https://junglewise.ai/threats/cve-2024-27834-apple-multiple-products-improper-authentication-vulnerability)
- [Apple CoreGraphics out-of-bounds write in file processing](https://junglewise.ai/threats/cve-2026-86950-an-out-of-bounds-write-issue-was-addressed-with-improved-bounds)
- [Apple Multiple Products integer overflow in WebKit content processing](https://junglewise.ai/threats/cve-2021-30952-apple-multiple-products-integer-overflow-in-webkit-content)
- [Hikvision IP Cameras improper authentication](https://junglewise.ai/threats/cve-2017-7921-hikvision-ip-cameras-improper-authentication)
- [Rockwell Automation Logix Designer authentication bypass in Logix Controllers](https://junglewise.ai/threats/cve-2021-22681-rockwell-automation-logix-designer-authentication-bypass-in-logix)