What’s Vulnerable › Vulnerabilities
CVE-2021-30817
- Severity: medium (CVSS 5.5 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: 2021-10-28 · updated 2026-06-17
Description
A permissions issue was addressed with improved validation. This issue is fixed in macOS Big Sur 11.5. A malicious application may be able to access data about the accounts the user is using Family Sharing with.
Affected products
- Apple macOS: before 11.5 — fixed in 11.5
How to fix
Upgrade to a fixed version: Apple macOS 11.5. Check the vendor advisory for mitigations.
References
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