SARA / Free Tools / CVE / CVE-2021-1789

CVE-2021-1789 — Apple Multiple Products Type Confusion Vulnerability

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 co

CVSS
— —
EPSS
24.00% (top 52.70%)
CWE
—
Published
2021-04-02T18:01:18.000Z
Last modified
2025-10-21T23:25:50.136Z
CVSS vector
—
CISA KEV — Actively Exploited
Added to KEV
2022-05-04
BOD 22-01 due
2022-05-25
Ransomware use
Unknown
View KEV detail
CVE-2021-1789 on CISA KEV →

01What is this vulnerability?

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.

02Affected products

VendorProductVersions
AppleiOS and iPadOSunspecified
ApplemacOSunspecified
ApplemacOSunspecified
ApplemacOSunspecified
ApplemacOSunspecified

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2022-05-04. Ransomware use: Unknown.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

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07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

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