What’s Vulnerable › Vulnerabilities

CVE-2020-27896

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-08 · updated 2026-06-17
• Weakness: CWE-22

Description

A path handling issue was addressed with improved validation. This issue is fixed in macOS Big Sur 11.0.1. A remote attacker may be able to modify the file system.

Affected products

• macOS: from 10.14.0 before 10.14.6; from 10.15.0 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_2019-004, 10.14.6-security_update_2019-005, 10.14.6-security_update_2019-006 (+9) — fixed in 10.14.6, 10.15.7
• Apple macOS: from 11.0 before 11.0.1 — fixed in 11.0.1

How to fix

Upgrade to a fixed version: macOS 10.14.6, 10.15.7; Apple macOS 11.0.1. Check the vendor advisory for mitigations.

References

• http://seclists.org/fulldisclosure/2020/Dec/26
• http://seclists.org/fulldisclosure/2020/Dec/32
• https://support.apple.com/en-us/HT211931
• https://support.apple.com/kb/HT212011
• http://seclists.org/fulldisclosure/2020/Dec/26
• http://seclists.org/fulldisclosure/2020/Dec/32
• https://support.apple.com/en-us/HT211931
• https://support.apple.com/kb/HT212011

Get alerted when CVE-2020-27896 or the next vulnerability affects your stack