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

CVSS 5.3 · Medium EPSS 0.56% · P68
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I. Basic Information for CVE-2021-21707

Vulnerability Information
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Vulnerability Title
Special characters break path parsing in XML functions
Source: NVD (National Vulnerability Database)
Vulnerability Description
In PHP versions 7.3.x below 7.3.33, 7.4.x below 7.4.26 and 8.0.x below 8.0.13, certain XML parsing functions, like simplexml_load_file(), URL-decode the filename passed to them. If that filename contains URL-encoded NUL character, this may cause the function to interpret this as the end of the filename, thus interpreting the filename differently from what the user intended, which may lead it to reading a different file than intended.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
特殊元素净化处理不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
PHP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PHP是一种在服务器端执行的脚本语言。 PHP 存在安全漏洞，攻击者可以通过 Xml 函数空字符绕过 PHP 的访问限制，以读取或更改文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
PHP GroupPHP 7.3.x ~ 7.3.33 -

II. Public POCs for CVE-2021-21707

#POC DescriptionSource LinkShenlong Link
1Exploit for the PHP 8.1.0-dev backdoor vulnerability (CVE-2021-21707)https://github.com/useru1k/php-8.1.0-dev-exploitPOC Details
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III. Intelligence Information for CVE-2021-21707

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IV. Related Vulnerabilities

Same product: PHP
Same vendor: PHP Group
Same weakness: CWE-159

V. Comments for CVE-2021-21707

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