Home Cyber Security News Apple Patched Three Actively Exploited Zero-Day Bugs In macOS/tvOS

Apple Patched Three Actively Exploited Zero-Day Bugs In macOS/tvOS

by Abeerah Hashim
Apple patched zero-day vulnerability with iOS 15.0.2

Apple has recently addressed three serious zero-day bugs in macOS and tvOS that were under attack before a fix was deployed.

Zero-Day Bugs In macOS/tvOS

Specifically, Apple has addressed two zero-day bugs in tvOS and one zero-day in macOS under active exploitation.

According to their advisory, one of the two bugs in tvOS include CVE-2021-30663 – an integer overflow vulnerability in Apple WebKit. Exploiting this bug could allow an adversary to execute arbitrary codes on the target device.

Whereas, the second vulnerability, CVE-2021-30665, was a memory corruption issue in WebKit. This vulnerability also allowed arbitrary code execution upon exploitation.

Apple has fixed both these bugs, together with many other vulnerabilities with the release of tvOS 14.5. The updates are available for Apple TV4K and Apple TV HD.

Regarding the third zero-day, it specifically affected the macOS Big Sur. As explained in their advisory, this vulnerability, CVE-2021-30713, could allow an app to bypass Privacy preferences due to permission issue.

Together with other vulnerabilities, Apple has fixed the bug with macOS Big Sur 11.4.

macOS Zero-Day Under Attack By XCSSET malware

Apple has confirmed the active exploitation of the three zero-days in its advisories. While it hasn’t shared many details about it. Yet, Jamf Protect has elaborated in a blog post that the XCSSET malware actively exploited this TCC bypass bug.

The vulnerability basically allows an adversary to gain access to screen recording, disk access, and other permissions. That’s what the malware abused it for.

XCSSET was using this bypass specifically for the purpose of taking screenshots of the user’s desktop without requiring additional permissions.

The researchers caught this malware abusing the flaw after observing a surge in the malware variants in the wild.

XCSSET isn’t a new malware. Rather it has undergone numerous improvements thereby producing new variants.

Apple users should rush to update their devices, particularly Macs, to avoid potential attacks via zero-day exploits.

You may also like

Latest Hacking News

Privacy Preference Center


The __cfduid cookie is used to identify individual clients behind a shared IP address and apply security settings on a per-client basis.

cookie_notice_accepted and gdpr[allowed_cookies] are used to identify the choices made from the user regarding cookie consent.

For example, if a visitor is in a coffee shop where there may be several infected machines, but the specific visitor's machine is trusted (for example, because they completed a challenge within your Challenge Passage period), the cookie allows Cloudflare to identify that client and not challenge them again. It does not correspond to any user ID in your web application, and does not store any personally identifiable information.

__cfduid, cookie_notice_accepted, gdpr[allowed_cookies]


DoubleClick by Google refers to the DoubleClick Digital Marketing platform which is a separate division within Google. This is Google’s most advanced advertising tools set, which includes five interconnected platform components.

DoubleClick Campaign Manager: the ad-serving platform, called an Ad Server, that delivers ads to your customers and measures all online advertising, even across screens and channels.

DoubleClick Bid Manager – the programmatic bidding platform for bidding on high-quality ad inventory from more than 47 ad marketplaces including Google Display Network.

DoubleClick Ad Exchange: the world’s largest ad marketplace for purchasing display, video, mobile, Search and even Facebook inventory.

DoubleClick Search: is more powerful than AdWords and used for purchasing search ads across Google, Yahoo, and Bing.

DoubleClick Creative Solutions: for designing, delivering and measuring rich media (video) ads, interactive and expandable ads.



The _ga is asssociated with Google Universal Analytics - which is a significant update to Google's more commonly used analytics service. This cookie is used to distinguish unique users by assigning a randomly generated number as a client identifier. It is included in each page request in a site and used to calculate visitor, session and campaign data for the sites analytics reports. By default it is set to expire after 2 years, although this is customisable by website owners.

The _gat global object is used to create and retrieve tracker objects, from which all other methods are invoked. Therefore the methods in this list should be run only off a tracker object created using the _gat global variable. All other methods should be called using the _gaq global object for asynchronous tracking.

_gid works as a user navigates between web pages, they can use the gtag.js tagging library to record information about the page the user has seen (for example, the page's URL) in Google Analytics. The gtag.js tagging library uses HTTP Cookies to "remember" the user's previous interactions with the web pages.

_ga, _gat, _gid