CVE-2021-1789 (GCVE-0-2021-1789)

Vulnerability from cvelistv5 – Published: 2021-04-02 18:01 – Updated: 2025-10-21 23:25
VLAI CISA KEV
Summary
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.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • Processing maliciously crafted web content may lead to arbitrary code execution
  • CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')
Assigner
References
Impacted products
Vendor Product Version
Apple iOS and iPadOS Affected: unspecified , < 14.4 (custom)
Create a notification for this product.
Apple macOS Affected: unspecified , < 11.2 (custom)
Create a notification for this product.
Apple macOS Affected: unspecified , < 7.3 (custom)
Create a notification for this product.
Apple macOS Affected: unspecified , < 14.4 (custom)
Create a notification for this product.
Apple macOS Affected: unspecified , < 14.0 (custom)
Create a notification for this product.
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 6872598a-235d-4bb0-abb6-8fbfb9b25cf4

Vulnerability ID: CVE-2021-1789

Status: Confirmed

Status Updated: 2022-05-04 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-05-04
Asserted: 2022-05-04
Scope
Notes: KEV entry: Apple Multiple Products Type Confusion Vulnerability | Affected: Apple / Multiple Products | Description: A type confusion issue affecting multiple Apple products allows processing of maliciously crafted web content, leading to arbitrary code execution. | Required action: Apply updates per vendor instructions. | Due date: 2022-05-25 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-1789
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-843
Feed CISA Known Exploited Vulnerabilities Catalog
Product Multiple Products
Due Date 2022-05-25
Date Added 2022-05-04
Vendorproject Apple
Vulnerabilityname Apple Multiple Products Type Confusion Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:27 UTC | Updated: 2026-02-06 07:17 UTC
Show details on NVD website
To clipboard 

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      "id": "CVE-2021-1789",
      "lastModified": "2024-11-21T05:45:07.013",
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      "published": "2021-04-02T18:15:21.747",
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    },
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