apple macos CVE-2021-30663 vulnerability in Apple Products
Published on September 8, 2021

product logo product logo product logo product logo product logo
An integer overflow was addressed with improved input validation. This issue is fixed in iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, Safari 14.1.1, macOS Big Sur 11.3.1. Processing maliciously crafted web content may lead to arbitrary code execution.

Vendor Advisory Vendor Advisory Vendor Advisory Vendor Advisory Vendor Advisory NVD

Known Exploited Vulnerability

This Apple Safari Webkit Browser Engine Integer Overflow Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Integer overflow. Processing maliciously crafted web content may lead to arbitrary code execution.

The following remediation steps are recommended / required by November 17, 2021: Apply updates per vendor instructions.

Vulnerability Analysis

CVE-2021-30663 can be exploited with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 2.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Integer Overflow or Wraparound

The software performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. An integer overflow or wraparound occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may wrap to become a very small or negative number. While this may be intended behavior in circumstances that rely on wrapping, it can have security consequences if the wrap is unexpected. This is especially the case if the integer overflow can be triggered using user-supplied inputs. This becomes security-critical when the result is used to control looping, make a security decision, or determine the offset or size in behaviors such as memory allocation, copying, concatenation, etc.


Products Associated with CVE-2021-30663

You can be notified by stack.watch whenever vulnerabilities like CVE-2021-30663 are published in these products:

Apple Macos
 
Apple Safari
 
Apple iPad OS
 
Apple iOS
 
Apple TV OS
 

What versions are vulnerable to CVE-2021-30663?