DEBIAN-CVE-2021-21705

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    DEBIAN-CVE-2021-21705

    Published: 4 Oct 2021Last Modified: 27 Aug 2026
    Upstream:
    CVE-2021-21705

    Summary:

    Details: In PHP versions 7.3.x below 7.3.29, 7.4.x below 7.4.21 and 8.0.x below 8.0.8, when using URL validation functionality via filter_var() function with FILTER_VALIDATE_URL parameter, an URL with invalid password field can be accepted as valid. This can lead to the code incorrectly parsing the URL and potentially leading to other security implications - like contacting a wrong server or making a wrong access decision.

    References: https://security-tracker.debian.org/tracker/CVE-2021-21705

    Affected packages

    Package

    Name: php7.4

    Purl: pkg:deb/debian/php7.4?arch=source&distro=bullseye

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -7.4.21-1+deb11u1

    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
    DEBIAN-CVE-2021-21705 | CVE-DB