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Vulnerabilities in the PHP language itself, and which PHP versions they affect.

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CVE-2021-21708

CRITICAL 9.8 CVSS 3.1
Published
February 27, 2022
Last modified
June 17, 2026
NVD status
Modified
Reported by
security@php.net
Weakness
CWE-416
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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

  • PHP — From 7.4.0 (including) to 7.4.28 (excluding)
  • PHP — From 8.0.0 (including) to 8.0.16 (excluding)
  • PHP — From 8.1.0 (including) to 8.1.3 (excluding)

References

  • bugs.php.net https://bugs.php.net/bug.php?id=81708 Exploit, Issue Tracking, Patch, Vendor Advisory
  • security.gentoo.org https://security.gentoo.org/glsa/202209-20 Third Party Advisory
  • security.netapp.com https://security.netapp.com/advisory/ntap-20220325-0004/ Third Party Advisory
  • nvd.nist.gov Official NVD record