CVE-2021-1821 Explained : Impact and Mitigation
Discover the details of CVE-2021-1821, a logic issue in macOS and watchOS resulting in a system denial of service when visiting malicious webpages. Learn about the impact, affected systems, and mitigation steps.
A logic issue in macOS and watchOS has been identified and addressed to improve state management. By visiting a specially crafted webpage, a system denial of service may occur. Find out more about CVE-2021-1821 below.
Understanding CVE-2021-1821
This section provides an overview of the vulnerability and its impact.
What is CVE-2021-1821?
CVE-2021-1821 is a logic issue in macOS and watchOS that has been fixed in watchOS 7.6 and macOS Big Sur 11.5. It can be exploited by visiting a maliciously crafted webpage, leading to a system denial of service.
The Impact of CVE-2021-1821
The vulnerability could result in a denial of service attack when a user accesses a specific webpage, posing a risk to system stability and security.
Technical Details of CVE-2021-1821
This section delves into the technical aspects of the vulnerability.
Vulnerability Description
The vulnerability stems from a logic issue in the state management process, potentially allowing attackers to disrupt system operations through a crafted webpage.
Affected Systems and Versions
Apple macOS versions less than 7.6 and watchOS versions less than 11.5 are affected by CVE-2021-1821, indicating the importance of updating to the latest versions.
Exploitation Mechanism
By tricking a user into visiting a specially designed webpage, attackers can exploit the logic issue to trigger a denial of service incident.
Mitigation and Prevention
In this section, we explore measures to mitigate and prevent the exploitation of CVE-2021-1821.
Immediate Steps to Take
Users are advised to update their macOS and watchOS to versions 7.6 and 11.5 or later to address the vulnerability and enhance system security.
Long-Term Security Practices
Employing safe browsing habits, avoiding suspicious websites, and staying vigilant against phishing attempts can help prevent falling victim to similar attacks in the future.
Patching and Updates
Regularly installing security patches and updates from Apple is crucial to safeguarding systems against known vulnerabilities and ensuring overall system integrity.