CVE-2021-30666 is a vulnerability in Apple iOS
Published on September 8, 2021

A buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 12.5.3. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..

Vendor Advisory NVD

Known Exploited Vulnerability

This Apple iOS12.x Buffer Overflow vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

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

Vulnerability Analysis

CVE-2021-30666 is exploitable 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.

What is a Buffer Overflow Vulnerability?

The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.

CVE-2021-30666 has been classified to as a Buffer Overflow vulnerability or weakness.

Products Associated with CVE-2021-30666

You can be notified by stack.watch whenever vulnerabilities like CVE-2021-30666 are published in these products:

Apple iOS

What versions of iOS are vulnerable to CVE-2021-30666?