#VU52670 Improper Resource Locking in macOS - CVE-2021-1861

Vulnerability identifier: #VU52670

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-1861

CWE-ID: CWE-413

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 gain access to sensitive information.

The vulnerability exists due to the way cache occupancy is handled in Safari on macOS. A remote attacker can track users on the internet by setting state in a cache.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

macOS: 11.0 20A2411 - 11.2.3 20D91

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External links
https://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.