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PHP versions 7.3.x below 7.3.16 Out-of-bounds Write Vulnerability


PHP versions 7.3.x below 7.3.16 suffers from out-of-bounds write vulnerability.


The information has been provided by Vendor

The original article can be found at:


In PHP versions 7.3.x below 7.3.16 and 7.4.x below 7.4.34, while using mb_strtolower() function with UTF-32LE encoding, certain invalid strings could cause PHP to overwrite stack-allocated buffer. This could lead to memory corruption, crashes and potentially code execution.

Vulnerable Systems:

PHP versions 7.3.x below 7.3.16

PHP versions 7.4.x below 7.4.34

CVE Information:


Disclosure Timeline:
Published Date:4/1/2020


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