What’s Vulnerable › Vulnerabilities

CVE-2020-3877

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% 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-125

Description

An out-of-bounds read was addressed with improved input validation. This issue is fixed in macOS Catalina 10.15.3, watchOS 6.1.2. A remote attacker may be able to cause unexpected application termination or arbitrary code execution.

Affected products

• macOS: before 10.15.3 — fixed in 10.15.3
• Apple watchOS: before 6.1.2 — fixed in 6.1.2

How to fix

Upgrade to a fixed version: macOS 10.15.3; Apple watchOS 6.1.2. Check the vendor advisory for mitigations.

References

• https://support.apple.com/HT210919
• https://support.apple.com/HT210921
• https://support.apple.com/HT210919
• https://support.apple.com/HT210921

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