# 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.

- Page: https://www.vulneraibility.com/cve/CVE-2021-1789
- CVSS: 8.8
- Known exploited: yes, in CISA KEV since 2022-05-04; CISA due date 2022-05-25
- EPSS: 13.98% (percentile 96.6)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2025-01-29)
- Weakness: CWE-843
- Published: 2021-04-02

## Affected versions

- Apple iOS and iPadOS: affected < 14.4
- Apple macOS: affected < 11.2; < 7.3; < 14.4; < 14.0

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://support.apple.com/en-us/HT212147
- [other] https://support.apple.com/en-us/HT212146
- [other] https://support.apple.com/en-us/HT212148
- [other] https://support.apple.com/en-us/HT212149
- [other] https://support.apple.com/en-us/HT212152
- [advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/
- [advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ/
- [advisory] https://security.gentoo.org/glsa/202104-03
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1789

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.