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.
Vulnerability Analysis
CVE-2021-30663 can be exploited with local system access, requires user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
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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Affected Versions
Apple macOS:- Version unspecified and below 11.3 is affected.
- Version unspecified and below 14.5 is affected.
- Version unspecified and below 12.5 is affected.
- Version unspecified and below 14.6 is affected.
- Version unspecified and below 14.1 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.