CVE-2020-9866

CVE-2020-9866: vulnerability in Apple macOS

Published · Updated

Follow this CVE+ Monitor macOS

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

3Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackepss 1.9%
A buffer overflow was addressed with improved bounds checking. This issue is fixed in macOS Catalina 10.15.6, Security Update 2020-004 Mojave, Security Update 2020-004 High Sierra. A buffer overflow may result in arbitrary code execution.
Affected products
Apple · macOS
Related CVEs — Apple macOS

In the same product, most dangerous first.

CVE-2021-30860HIGHCVE-2021-30860EPSS 76.0%KEVCVE-2021-30657MEDIUMCVE-2021-30657EPSS 68.5%KEVCVE-2025-43300CRITICALCVE-2025-43300EPSS 65.2%KEVCVE-2023-41064HIGHCVE-2023-41064EPSS 53.4%KEVCVE-2023-32434HIGHCVE-2023-32434EPSS 51.5%KEVCVE-2021-30807HIGHCVE-2021-30807EPSS 28.8%KEV