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PHP Vulnerability: CVE-2021-21708

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PHP Vulnerability: CVE-2021-21708

Severity
7
CVSS
(AV:N/AC:M/Au:N/C:P/I:P/A:P)
Published
02/27/2022
Created
03/14/2022
Added
03/14/2022
Modified
03/14/2022

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.

Solution(s)

  • php-upgrade-7_4_28
  • php-upgrade-8_0_16
  • php-upgrade-8_1_3

References

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