CVE-2021-1813
macOS vulnerability analysis and mitigation

Overview

CVE-2021-1813 is a validation issue in Apple's Foundation framework that was discovered and reported by Cees Elzinga. The vulnerability was fixed in multiple Apple operating systems including Security Update 2021-002 Catalina, Security Update 2021-003 Mojave, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, and macOS Big Sur 11.3, released on April 26, 2021 (Apple Security).

Technical details

The vulnerability stems from a validation issue in the Foundation framework that was addressed with improved logic. The severity of this vulnerability is rated as HIGH with a CVSS v3.1 base score of 7.8 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) (NVD).

Impact

When exploited, this vulnerability allows a malicious application to gain root privileges on the affected system (Apple Security).

Mitigation and workarounds

Apple addressed this vulnerability by implementing improved validation logic in the affected systems. Users should update to Security Update 2021-002 Catalina, Security Update 2021-003 Mojave, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, or macOS Big Sur 11.3 depending on their system (Apple Security).

Additional resources


SourceThis report was generated using AI

Related macOS vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2025-43359CRITICAL9.8
  • macOSmacOS
  • Kernel
NoYesSep 15, 2025
CVE-2025-43358HIGH8.8
  • macOSmacOS
  • Shortcuts
NoYesSep 15, 2025
CVE-2025-43400MEDIUM6.3
  • macOSmacOS
  • FontParser
NoYesSep 29, 2025
CVE-2025-43355MEDIUM5.5
  • macOSmacOS
  • MobileStorageMounter
NoYesSep 15, 2025
CVE-2025-43353MEDIUM5.5
  • macOSmacOS
  • Libinfo
NoYesSep 15, 2025

Free Vulnerability Assessment

Benchmark your Cloud Security Posture

Evaluate your cloud security practices across 9 security domains to benchmark your risk level and identify gaps in your defenses.

Request assessment

Get a personalized demo

Ready to see Wiz in action?

"Best User Experience I have ever seen, provides full visibility to cloud workloads."
David EstlickCISO
"Wiz provides a single pane of glass to see what is going on in our cloud environments."
Adam FletcherChief Security Officer
"We know that if Wiz identifies something as critical, it actually is."
Greg PoniatowskiHead of Threat and Vulnerability Management