What’s Vulnerable › Vulnerabilities

CVE-2020-27921

• Severity: high (CVSS 7.0 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: 2021-04-02 · updated 2026-06-17
• Weakness: CWE-362

Description

A race condition was addressed with improved state handling. This issue is fixed in macOS Big Sur 11.1, Security Update 2020-001 Catalina, Security Update 2020-007 Mojave, macOS Big Sur 11.0.1. An application may be able to execute arbitrary code with kernel privileges.

Affected products

• macOS: before 11.0.1; before 11.1.0 — fixed in 11.0.1, 11.1.0

How to fix

Upgrade to a fixed version: macOS 11.0.1, 11.1.0. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/HT211931
• https://support.apple.com/en-us/HT212011
• https://support.apple.com/en-us/HT211931
• https://support.apple.com/en-us/HT212011

Get alerted when CVE-2020-27921 or the next vulnerability affects your stack