PT-2021-13623 · Apple · Macos Big Sur+1

Håvard Mikkelsen Ottestad · Published 2021-04-26 · Updated 2021-09-23 · CVE-2021-1855

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions: macOS Big Sur versions prior to 11.3

Description: A logic issue was addressed with improved state management. A malicious website may be able to force unnecessary network connections to fetch its favicon.

Recommendations: For macOS Big Sur versions prior to 11.3, update to macOS Big Sur 11.3 to resolve the issue. As a temporary workaround, consider restricting access to potentially malicious websites to minimize the risk of exploitation.

Fix

Related Identifiers

CVE-2021-1855

Affected Products

Apple Macos

Macos Big Sur

References · 6

• https://support.apple.com/en-us/HT212325 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-1855 · Security Note
• https://osv.dev/vulnerability/CVE-2021-1855 · Vendor Advisory
• https://t.me/cvenotify/21366 · Telegram Post
• https://support.apple.com/en-us/103126 · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1855 · Note