High severity7.8NVD Advisory· Published Oct 28, 2021· Updated Jun 17, 2026

CVE-2021-30821

Description

A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Monterey 12.0.1, Security Update 2021-007 Catalina, macOS Big Sur 11.6.1. A malicious application may be able to execute arbitrary code with kernel privileges.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Apple Inc./macOS Big Surllm-fuzzy
Range: = 11.6.1
Apple Inc./macOS Montereyllm-fuzzy
Range: = 12.0.1
Apple Inc./macOSv5
Range: unspecified

Patches

Vulnerability mechanics

References

support.apple.com/en-us/HT212869nvdVendor Advisory
support.apple.com/en-us/HT212871nvdVendor Advisory
support.apple.com/en-us/HT212872nvdVendor Advisory

News mentions

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