HIGH
The escapeshellarg function in ext/standard/exec.c in PHP before 5.4.42, 5.5.x before 5.5.26, and 5.6.x before 5.6.10 on Windows allows remote attackers to execute arbitrary OS commands via a crafted string to an application that accepts command-line arguments for a call to the PHP system function.
http://git.php.net/?p=php-src.git;a=commit;h=d2ac264ffea5ca2e85640b6736e0c7cd4ee9a4a9
http://openwall.com/lists/oss-security/2015/06/18/6
http://php.net/ChangeLog-5.php
http://www.securityfocus.com/bid/75290
http://www.securitytracker.com/id/1032709
Source: MITRE
Published: 2016-05-16
Updated: 2017-09-22
Type: CWE-78
Base Score: 10
Vector: (AV:N/AC:L/Au:N/C:C/I:C/A:C)
Impact Score: 10
Exploitability Score: 10
Severity: HIGH
Base Score: 9.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 3.9
Severity: CRITICAL