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CVE-2021-1789

HIGH
8.8
CVSS Score
Published: April 2, 2021 at 06:01 PM UTC
Updated: June 17, 2026 at 03:32 AM UTC
7 products affected across 3 vendorsmacOSFedoraiPhone OS

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Severity
HIGH8.8
Exploitation
CISA KEV
Exploit prediction
EPSS 14%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score14.0%

EPSS (Exploit Prediction Scoring System) estimates a 14.0% chance this CVE is exploited in the wild within the next 30 days — higher than 97% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

A type confusion issue affecting multiple Apple products allows processing of maliciously crafted web content, leading to arbitrary code execution.

Required Action
Apply updates per vendor instructions.
Ransomware Use
Unknown
Added to KEV
May 4, 2022
Remediation Due
May 25, 2022
1617 days overdue
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-1789

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

iPadOS· Apple
95%
v < 14.4
Affected range stops below 14.4, so it looks safe — our inference, not a vendor statement
iPhone OS· Apple
95%
v < 14.4
Affected range stops below 14.4, so it looks safe — our inference, not a vendor statement
macOS· Apple
95%
v < 11.2v < 14.0v < 14.4v < 7.310.14 ≤ v < 10.14.610.15 ≤ v < 10.15.711.0 ≤ v < 11.210.14.610.14.6 security_update_2019-00410.14.6 security_update_2019-00510.14.6 security_update_2019-00610.14.6 security_update_2019-00710.14.6 security_update_2020-00110.14.6 security_update_2020-00210.14.6 security_update_2020-00310.14.6 security_update_2020-00410.14.6 security_update_2020-00510.14.6 security_update_2020-00610.14.6 security_update_2020-00710.14.6 supplemental_update10.14.6 supplemental_update_210.15.710.15.7 supplemental_update
Affected range stops below 10.14.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.15.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 11.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.3, so it looks safe — our inference, not a vendor statement
tvOS· Apple
95%
v < 14.4
Affected range stops below 14.4, so it looks safe — our inference, not a vendor statement
watchOS· Apple
95%
v < 7.3
Affected range stops below 7.3, so it looks safe — our inference, not a vendor statement
Fedora· Fedora Projectrpm
95%
3233
WebKitGTK· Webkitgtk
95%
v < 2.30.6
Affected range stops below 2.30.6, so it looks safe — our inference, not a vendor statement

References (9)

Vendor Advisoryx_refsource_FEDORABroken LinkMailing List
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ/
Vendor Advisoryx_refsource_FEDORABroken LinkMailing List
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202104-03
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://support.apple.com/en-us/HT212146
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://support.apple.com/en-us/HT212147
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://support.apple.com/en-us/HT212148
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://support.apple.com/en-us/HT212149
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://support.apple.com/en-us/HT212152

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-843

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