What’s Vulnerable › Vulnerabilities

CVE-2021-30688

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-08 · updated 2026-06-17

Description

A malicious application may be able to break out of its sandbox. This issue is fixed in macOS Big Sur 11.4, Security Update 2021-003 Catalina. A path handling issue was addressed with improved validation.

Affected products

• macOS: from 10.15 through 10.15.6; 10.15.7, 10.15.7-security_update_2020, 10.15.7-security_update_2020-001, 10.15.7-security_update_2020-005, 10.15.7-security_update_2020-007, 10.15.7-security_update_2021-001 (+2)
• Apple macOS: from 11.0 before 11.4 — fixed in 11.4

How to fix

Upgrade to a fixed version: Apple macOS 11.4. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/HT212529
• https://support.apple.com/en-us/HT212530
• https://support.apple.com/en-us/HT212529
• https://support.apple.com/en-us/HT212530

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