CVE-2021-1789 (GCVE-0-2021-1789)
Vulnerability from cvelistv5 – Published: 2021-04-02 18:01 – Updated: 2025-10-21 23:25Summary
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)
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
9 references
| URL | Tags |
|---|---|
| https://support.apple.com/en-us/HT212147 | x_refsource_MISC |
| https://support.apple.com/en-us/HT212146 | x_refsource_MISC |
| https://support.apple.com/en-us/HT212148 | x_refsource_MISC |
| https://support.apple.com/en-us/HT212149 | x_refsource_MISC |
| https://support.apple.com/en-us/HT212152 | x_refsource_MISC |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://security.gentoo.org/glsa/202104-03 | vendor-advisoryx_refsource_GENTOO |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
5 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Apple | iOS and iPadOS |
Affected:
unspecified , < 14.4
(custom)
|
guessed | |
| Apple | macOS |
Affected:
unspecified , < 11.2
(custom)
|
guessed | |
| Apple | macOS |
Affected:
unspecified , < 7.3
(custom)
|
guessed | |
| Apple | macOS |
Affected:
unspecified , < 14.4
(custom)
|
guessed | |
| Apple | macOS |
Affected:
unspecified , < 14.0
(custom)
|
guessed |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 185f6ee6-7361-4206-bfec-a2692a0776a0
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 13:25 UTC
| Updated: 2026-02-06 07:53 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 0384750b-11b8-42e7-bd4e-7ebaf704b923
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 11:13 UTC
| Updated: 2026-06-23 11:13 UTC
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.