CVE-2021-1789
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
- CVSS score
- 8.8 (v3.1)
- Severity
- HIGH
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H- Weakness (CWE)
- CWE-843
- EPSS score
- 14.0% (97th percentile)
- In CISA KEV
- Yes, added May 4, 2022
- In EU EUVD
- Yes (EUVD-2021-7253)
- Published
- April 2, 2021
- NVD last modified
- June 17, 2026
- Status
- Analyzed
CISA Known Exploited Vulnerability
Apple Multiple Products Type Confusion Vulnerability
Added to the KEV catalog on May 4, 2022; federal remediation due May 25, 2022.
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2021-7253 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on October 21, 2025.
View on the EU Vulnerability DatabaseAffected products
- apple / ipados
- apple / iphone os
- apple / mac os x
- apple / mac os x
- apple / mac os x
- apple / mac os x
- apple / mac os x
- apple / mac os x
- apple / mac os x
- apple / mac os x
- apple / mac os x
- apple / mac os x
- apple / mac os x
- apple / mac os x
- apple / mac os x
- apple / mac os x
- apple / mac os x
- apple / mac os x
- apple / mac os x
- apple / macos
- apple / tvos
- apple / watchos
- fedoraproject / fedora
- fedoraproject / fedora
- webkitgtk / webkitgtk
Certified products that may be affected
1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.
- Apple macOS 11 Big Sur: Contacts - Apple Inc. - Common Criteria CCEVS-VR-VID-11243-2022 - archived
References
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ/(Broken Link, Mailing List)
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/(Broken Link, Mailing List)
- https://security.gentoo.org/glsa/202104-03(Third Party Advisory)
- https://support.apple.com/en-us/HT212146(Release Notes, Vendor Advisory)
- https://support.apple.com/en-us/HT212147(Release Notes, Vendor Advisory)
- https://support.apple.com/en-us/HT212148(Release Notes, Vendor Advisory)
- https://support.apple.com/en-us/HT212149(Release Notes, Vendor Advisory)
- https://support.apple.com/en-us/HT212152(Release Notes, Vendor Advisory)
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1789(US Government Resource)
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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