What’s Vulnerable › Vulnerabilities

CVE-2020-3851

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-10-27 · updated 2026-06-17
• Weakness: CWE-416

Description

A use after free issue was addressed with improved memory management. This issue is fixed in macOS Catalina 10.15.4, Security Update 2020-002 Mojave, Security Update 2020-002 High Sierra, macOS Catalina 10.15.3, Security Update 2020-001 Mojave, Security Update 2020-001 High Sierra. An application may be able to gain elevated privileges.

Affected products

• macOS: from 10.15.2 before 10.15.3; from 10.13.6 before 10.15.4 — fixed in 10.15.3, 10.15.4

How to fix

Upgrade to a fixed version: macOS 10.15.3, 10.15.4. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/HT210919
• https://support.apple.com/en-us/HT211100
• https://support.apple.com/en-us/HT210919
• https://support.apple.com/en-us/HT211100

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