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8.2 High

CVE-2021-21708 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…

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.

Affected products and versions

Product Affected versions Fixed in
PHP 8.1 8.1.X → < 8.1.3 8.1.3
PHP 8.0 8.0.X → < 8.0.16 8.0.16
PHP 7.4 7.4.x → < 7.4.28 7.4.28

References

Timeline

  1. Published
  2. Last modified

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