What is CVE-2021-1855?

CVE-2021-1855 is a medium-severity vulnerability in Apple macOS. CVSS score: 6.5/10. Published 2021-09-08.

How severe is CVE-2021-1855?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Apple macOS

CVE-2021-1855

A logic issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3. A malicious website may be able to force unnecessary network connections to fetch its favicon.

EPSS: 0.008 (52.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Apple Macos — versions unspecified

References

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

Frequently asked questions

What is CVE-2021-1855?: CVE-2021-1855 is a medium-severity vulnerability in Apple macOS. CVSS score: 6.5/10. Published 2021-09-08.
How severe is CVE-2021-1855?: Medium severity. CVSS v3 base score is 6.5 out of 10.