High severity7.8NVD Advisory· Published Sep 8, 2021· Updated Jun 17, 2026
CVE-2021-1840
CVE-2021-1840
Description
A memory corruption issue was addressed with improved validation. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina, Security Update 2021-003 Mojave. A local attacker may be able to elevate their privileges.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
4- Range: < Security Update 2021-003
- Range: < Security Update 2021-002
- Range: < 11.3
- Range: unspecified
Patches
Vulnerability mechanics
References
3- support.apple.com/en-us/HT212325nvdVendor Advisory
- support.apple.com/en-us/HT212326nvdVendor Advisory
- support.apple.com/en-us/HT212327nvdVendor Advisory
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