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CVE-2021-1789

Apple Multiple Products Type Confusion

8.8 HIGHActively exploited (CISA KEV)EPSS 14.0%
  1. Published2 Apr 2021
  2. Added to CISA KEV4 May 2022
  3. Remediation due25 May 2022
Actively exploited (CISA KEV)

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

Added to KEV: 4 May 2022Federal remediation due: 25 May 2022

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 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Webkitgtk< 2.30.6
Apple iPadOS< 14.4
Apple iPhone OS< 14.4
Apple macOS≥ 11.0 < 11.2
Apple Mac OS X≥ 10.14 < 10.14.6 · ≥ 10.15 < 10.15.7 · 10.14.6 · 10.15.7
Apple Tvos< 14.4
Apple Watchos< 7.3
Fedoraproject Fedora32 · 33

Remediation

Fixed in
Webkitgtk≥ 2.30.6
Apple iPadOS≥ 14.4
Apple iPhone OS≥ 14.4
Apple macOS≥ 11.2
Apple Mac OS X≥ 10.14.6
Apple Tvos≥ 14.4
Apple Watchos≥ 7.3

References

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Frequently asked

Is CVE-2021-1789 being actively exploited?

Yes. CVE-2021-1789 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 4 May 2022.

How severe is CVE-2021-1789?

CVE-2021-1789 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 14.0% probability of exploitation.

Which products are affected by CVE-2021-1789?

Affected products include Webkitgtk, Apple iPadOS, Apple iPhone OS, Apple macOS, Apple Mac OS X, and 3 more.

How do I fix CVE-2021-1789?

Upgrade affected software to a fixed version, for example Webkitgtk 2.30.6, Apple iPadOS 14.4, Apple iPhone OS 14.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-1789 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.