CVE-2021-21708

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    CVE-2021-21708

    Published: 27 Feb 2022Last Modified: 24 Oct 2026

    Summary:

    Details: 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.

    References: https://security.gentoo.org/glsa/202209-20, https://security.netapp.com/advisory/ntap-20220325-0004/, https://bugs.php.net/bug.php?id=81708

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 3c7824e16ec4c3cee417262445d2c2b66531c10f
    Fixed -33fb9dcbc31840296ac495c74532f71a463380cd

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-21708 | CVE-DB