CVE-2021-1789
Apple Multiple Products Type Confusion Vulnerability
- High 8.8
- Exploited: added to CISA KEV 4 May 2022
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.
Key facts
- Published
- 2 Apr 2021
- Last changed
- 21 Oct 2025
- Assigned by
- apple
- KEV added
- 4 May 2022
- KEV fix due
- 25 May 2022
- EPSS
- 13.975% likely to be exploited in the next 30 days, higher than 96.608% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 8.8CVSS 3.1, Highfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Apple | iOS and iPadOS |
|
| Apple | macOS |
|
| Apple | macOS |
|
| Apple | macOS |
|
| Apple | macOS |
|
Timeline
- 2 Apr 2021 Published
- 4 May 2022 CVE-2021-1789 added to CISA KEV
- 4 May 2022 Added to the CISA KEV catalogue