DEBIAN-CVE-2021-21704

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    DEBIAN-CVE-2021-21704

    Published: 4 Oct 2021Last Modified: 27 Aug 2026
    Upstream:
    CVE-2021-21704

    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 Firebird PDO driver extension, a malicious database server could cause crashes in various database functions, such as getAttribute(), execute(), fetch() and others by returning invalid response data that is not parsed correctly by the driver. This can result in crashes, denial of service or potentially memory corruption.

    References: https://security-tracker.debian.org/tracker/CVE-2021-21704

    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-2021-21704 | CVE-DB