What’s Vulnerable › Vulnerabilities

CVE-2020-27897

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% 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-787

Description

An out-of-bounds write issue was addressed with improved bounds checking. 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: from 10.14 before 10.14.6; from 10.15 before 10.15.7; 10.14.6, 10.14.6-security_update_2019-001, 10.14.6-security_update_2019-002, 10.14.6-security_update_2020-001, 10.14.6-security_update_2020-002, 10.14.6-security_update_2020-003 (+7) — fixed in 10.14.6, 10.15.7
• Apple macOS: from 11.0 before 11.1 — fixed in 11.1

How to fix

Upgrade to a fixed version: macOS 10.14.6, 10.15.7; Apple macOS 11.1. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/HT211931
• https://support.apple.com/en-us/HT212011
• https://www.zerodayinitiative.com/advisories/ZDI-21-486/
• https://support.apple.com/en-us/HT211931
• https://support.apple.com/en-us/HT212011
• https://www.zerodayinitiative.com/advisories/ZDI-21-486/

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