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
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: d14c0603-98bc-4d21-ab59-c510442bc7a9
Exploited: Yes
Timestamps
First Seen: 2022-05-04
Asserted: 2022-05-04
Scope
Notes: 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: 2026-10-02 08:10 CEST
| Updated: 2026-10-02 08:10 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 74d11c78-4c25-48e4-81e9-8c7551372ee6
Exploited: Yes
Timestamps
First Seen: 2022-05-04
Asserted: 2022-05-04
Scope
Notes: 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) | EPSS: 0.13975 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.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,... |
| Cve Id | CVE-2021-1789 |
| Vendor | Apple |
| Ghsa Id | None |
| Product | iOS and iPadOS, macOS |
| Added Date | 2022-05-04T00:00:00.000Z |
| Cvss Score | 8.8 |
| Epss Score | 0.13975 |
| Previous Ids | |
| Cvss Severity | HIGH |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.9644 |
| Used In Malware | unknown |
| Vulnerability Id | CVE-2021-1789 |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-10-02 09:11 CEST
| Updated: 2026-10-02 09:11 CEST
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Loading…
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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.
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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.
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