CVE-2021-21704

    Dashboard / Vulnerabilities / CVE-2021-21704

    CVE-2021-21704

    Published: 4 Oct 2021Last Modified: 7 Aug 2026

    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.gentoo.org/glsa/202209-20, https://security.netapp.com/advisory/ntap-20211029-0006/, https://bugs.php.net/bug.php?id=76448, https://bugs.php.net/bug.php?id=76449, https://bugs.php.net/bug.php?id=76450, https://bugs.php.net/bug.php?id=76452

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 52ace952a1b65ca80fc2617f11c2fa6dd03f51bd
    Fixed -0960f2cdcf27e843ab5102559d291de9997739ea

    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-2021-21704 | CVE-DB