What is CVE-2021-1861?

CVE-2021-1861 is a medium-severity vulnerability in Apple macOS. CVSS score: 4.3/10. Published 2021-09-08.

How severe is CVE-2021-1861?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Apple macOS

CVE-2021-1861

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.

EPSS: 0.009 (55.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.

Affected products

Apple Macos — versions unspecified

References

product-security@apple.com (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-1861?: CVE-2021-1861 is a medium-severity vulnerability in Apple macOS. CVSS score: 4.3/10. Published 2021-09-08.
How severe is CVE-2021-1861?: Medium severity. CVSS v3 base score is 4.3 out of 10.