CVE-2021-30663 vulnerability in Apple Products
Published on September 8, 2021
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.
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
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What versions are vulnerable to CVE-2021-30663?
- Apple Macos Version 11.0 Fixed in Version 11.3.1
- Apple Safari Fixed in Version 14.1.1
- Apple iPad OS Version 14.0 Fixed in Version 14.5.1
- Apple iOS Fixed in Version 12.5.3
- Apple iOS Version 14.0 Fixed in Version 14.5.1
- Apple TV OS Fixed in Version 14.6