27.05.2021 Apple Patches Three Flaws Exploited in the Wild

by Elena Lapina

On 24 May 2021, Apple released patches for three vulnerabilities that the company says may have been actively exploited. Researchers released a separate report on one of the fixed flaws in macOS saying malicious actors have been leveraging this vulnerability. We recommend patching as soon as possible.


  • Apple’s patches on 24 May have fixed two flaws (tracked as CVE-2021-30663 and CVE-2021-30665) that impact WebKit on Apple TV 4K and Apple TV HD devices, and one, tracked as CVE-2021-30713, that impacts macOS Big Sur devices.
  • CVE-2021-30713 is a default permission issue found in the Transparency, Consent, and Control (TCC) framework, a macOS subsystem that blocks installed apps from accessing sensitive user information.
  • Threat actors could exploit this vulnerability by crafting a malicious application to bypass Privacy preferences of a user. They could then gain full disk access, screen recording, or other permissions without requiring the user’s explicit consent.
  • According to researchers, XCSSET malware has been using this flaw to hijack other apps’ permissions for the purpose of taking screenshots of a victim’s desktop.


  • We recommend updating your device as soon as possible as actively exploited flaws present a high risk to unpatched devices.
  • Unpatched CVE-2021-30713 could allow threat actors to take screenshots, extract files, and record audio on victims’ computers.
  • Go to Apple menu, then click Software Update to check for updates.

References: Apple


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