CVE-2020-3843

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-02-27 · updated 2026-06-17
Weakness: CWE-787

Description

A memory corruption issue was addressed with improved input validation. This issue is fixed in iOS 12.4.7, watchOS 5.3.7. A remote attacker may be able to cause unexpected system termination or corrupt kernel memory.

Affected products

Apple Iphone Os: before 12.4.7 — fixed in 12.4.7
Apple watchOS: before 5.3.7 — fixed in 5.3.7

How to fix

Upgrade to a fixed version: Apple Iphone Os 12.4.7; Apple watchOS 5.3.7. Check the vendor advisory for mitigations.

References

http://packetstormsecurity.com/files/162119/iOS-macOS-Radio-Proximity-Kernel-Memory-Corruption.html
https://support.apple.com/HT211169
https://support.apple.com/HT211176
http://packetstormsecurity.com/files/162119/iOS-macOS-Radio-Proximity-Kernel-Memory-Corruption.html
https://support.apple.com/HT211169
https://support.apple.com/HT211176

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