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

Vulnerability from cvelistv5 – Published: 2021-04-02 18:01 – Updated: 2025-10-21 23:25
VLAI CISA Previdian
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 · CISA-ADP (v2.0.3)
Decision recorded 2025-01-29 17:34 UTC
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 CPE status
Apple iOS and iPadOS Affected: unspecified , < 14.4 (custom)
guessed Create a notification for this product.
Apple macOS Affected: unspecified , < 11.2 (custom)
guessed Create a notification for this product.
Apple macOS Affected: unspecified , < 7.3 (custom)
guessed Create a notification for this product.
Apple macOS Affected: unspecified , < 14.4 (custom)
guessed Create a notification for this product.
Apple macOS Affected: unspecified , < 14.0 (custom)
guessed Create a notification for this product.
CISA
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
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 86af1b0d-8a35-4647-9635-30d7bd94e04f

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: KEVIntel entry: 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,... | Affected: Apple / iOS and iPadOS, macOS | CVSS: 8.8 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title 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,...
Vendor Apple
Product iOS and iPadOS, macOS
Added Date 2022-05-04T00:00:00.000Z
Cvss Score 8.8
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:05 UTC | Updated: 2026-07-10 06:14 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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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T13:55:35+00:00",
      "cve": "CVE-2021-1789",
      "id": "CVE-2021-1789",
      "initial_release_date": "2021-03-22T00:00:00+00:00",
      "product_status:fixed": "70",
      "product_status:known_affected": "9",
      "product_status:known_not_affected": "436",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "webkitgtk: Type confusion issue leading to arbitrary code execution",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-1789.json",
      "version": "3"
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      "aggregate_severity": "critical",
      "current_release_date": "2026-09-15T02:33:00Z",
      "cve": "CVE-2021-1789",
      "id": "CVE-2021-1789",
      "initial_release_date": "2023-02-15T03:50:17Z",
      "product_status:recommended": "1002",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-1789",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-1789.json",
      "version": "19"
    },
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  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.