CVE-2021-1789
Apple Multiple Products Type Confusion Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 25 May 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 13.98% probability · 97th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 4 May 2022 · due 25 May 2022
- Weakness
- CWE-843
- Affected
- apple/ipados · apple/iphone os · apple/mac os x · apple/macos · apple/tvos · apple/watchos · fedoraproject/fedora · webkitgtk/webkitgtk
- Source
- product-security@apple.com
EPSS 14.0% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-1789
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/202104-03Third Party Advisory
- https://support.apple.com/en-us/HT212146Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212147Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212148Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212149Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212152Release Notes, Vendor Advisory
- 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/202104-03Third Party Advisory
- https://support.apple.com/en-us/HT212146Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212147Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212148Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212149Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212152Release Notes, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1789US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.