What’s Vulnerable › Vulnerabilities
CVE-2021-1861
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.9% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2021-09-08 · updated 2026-06-17
Description
An issue existed in determining cache occupancy. The issue was addressed through improved logic. This issue is fixed in macOS Big Sur 11.3. A malicious website may be able to track users by setting state in a cache.
Affected products
- Apple macOS: from 11.0 before 11.3 — fixed in 11.3
How to fix
Upgrade to a fixed version: Apple macOS 11.3. Check the vendor advisory for mitigations.
References
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