Vulnerability identifier: #VU52671

Vulnerability risk: Low

CVSSv3.1: 4.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1855

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
macOS
Operating systems & Components / Operating system

Vendor: Apple Inc.

Description

The vulnerability allows a remote attacker to perform unnecessary network connections.

The vulnerability exists due to improper management of internal resources within Safari on macOS. A remote attacker can create a specially crafted website and force unnecessary network connections to fetch its favicon.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

macOS: 11.0 20A2411 - 11.2.3 20D91

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External links
http://support.apple.com/en-us/HT212325

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.