Is CVE-2021-1789 actively exploited?

CVE-2021-1789 has no public evidence of in-the-wild exploitation as of 2025-10-23.

What is the CVSS score for CVE-2021-1789?

CVE-2021-1789 has a CVSS score of 8.8 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

How do I patch CVE-2021-1789?

Patch guidance is available from apple security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-1789.

Fix CVE-2021-1789 - HIGH apple ipados

Q: Which products are affected by CVE-2021-1789?

26 products: apple ipados, apple iphone os, apple mac os x, apple mac os x, apple mac os x, and 21 more.

Description

A type confusion issue was addressed with improved state handling. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, tvOS 14.4, watchOS 7.3, iOS 14.4 and iPadOS 14.4, Safari 14.0.3. Processing maliciously crafted web content may lead to arbitrary code execution.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: required
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-843 CWE-843

Metadata

Primary Vendor: APPLE
Published: 4/2/2021
Last Modified: 10/23/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

apple : ipadosapple : iphone_osapple : mac_os_xapple : mac_os_xapple : mac_os_xapple : mac_os_xapple : mac_os_xapple : mac_os_xapple : mac_os_xapple : mac_os_xapple : mac_os_xapple : mac_os_xapple : mac_os_xapple : mac_os_xapple : mac_os_xapple : mac_os_xapple : mac_os_xapple : mac_os_xapple : mac_os_xapple : mac_os_xapple : macosapple : tvosapple : watchosfedoraproject : fedorafedoraproject : fedorawebkitgtk : webkitgtk

Remediation Guidance

Executive Summary

View on NIST NVD