CISA KEV · Known exploitedHigh

CVE-2021-1789

Apple Multiple Products

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.

CVSS: 8.8
EPSS: 13.2%
CISA KEV: Listed
Published: 2021.04.03

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability13.2%

Technical severityCVSS 8.8

Vulnerability overview

Affected product and versions

Product: Apple Multiple Products
Affected versions: unspecified, < 14.4, >= 10.14 < 10.14.6, >= 10.15 < 10.15.7, 10.14.6, 10.15.7, >= 11.0 < 11.2, < 7.3, 32, 33, < 2.30.6
Fixed versions: 14.4, 10.14.6, 10.15.7, 11.2, 7.3, 2.30.6

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply updates per vendor instructions.

Due date: 2022.05.25

1
Identify
Confirm that Apple Multiple Products and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE: CWE-843
KEV added: 2022.05.04
Ransomware use: 미확인