CWE
159
Advisory Published
CVE Published
CVE Published
Updated

CVE-2021-21707: Special characters break path parsing in XML functions

First published: Mon Nov 15 2021(Updated: )

Fixed bug (special character is breaking the path in xml function). (CVE-2021-21707)

Credit: security@php.net security@php.net

Affected SoftwareAffected VersionHow to fix
PHP PHP>=7.3.0<7.3.33
PHP PHP>=7.4.0<7.4.26
PHP PHP>=8.0.0<8.0.13
NetApp Clustered Data ONTAP
Debian Debian Linux=10.0
Debian Debian Linux=11.0
Tenable Tenable.sc<5.21.0
PHP PHP<8.0.13
8.0.13
debian/php7.4
7.4.33-1+deb11u5
7.4.33-1+deb11u7

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Frequently Asked Questions

  • What is the vulnerability ID for this bug?

    The vulnerability ID for this bug is CVE-2021-21707.

  • What is the severity level of CVE-2021-21707?

    The severity level of CVE-2021-21707 is medium with a severity value of 5.3.

  • Which versions of PHP are affected by CVE-2021-21707?

    PHP versions 7.3.x below 7.3.33, 7.4.x below 7.4.26, and 8.0.x below 8.0.13 are affected by CVE-2021-21707.

  • How does CVE-2021-21707 impact the affected software?

    CVE-2021-21707 can cause certain XML parsing functions in PHP to interpret an URL-encoded NUL character as the end of the filename, potentially leading to file path manipulation.

  • Where can I find more information about CVE-2021-21707?

    More information about CVE-2021-21707 can be found at the following references: [Mitre](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21707), [Ubuntu Security Notices - USN-5300-1](https://ubuntu.com/security/notices/USN-5300-1), [Ubuntu Security Notices - USN-5300-2](https://ubuntu.com/security/notices/USN-5300-2).

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