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PHP vulnerability CVE-2021-21708

Description

In PHP versions 7.4.x below 7.4.28, 8.0.x below 8.0.16, and 8.1.x below 8.1.3, when using filter functions with FILTER_VALIDATE_FLOAT filter and min/max limits, if the filter fails, there is a possibility to trigger use of allocated memory after free, which can result it crashes, and potentially in overwrite of other memory chunks and RCE. This issue affects: code that uses FILTER_VALIDATE_FLOAT with min/max limits. ([CVE-2021-21708](<https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21708>)) Impact There is no impact; F5 products are not affected by this vulnerability.


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