Vulnerability Details CVE-2015-6837
The xsl_ext_function_php function in ext/xsl/xsltprocessor.c in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13, when libxml2 before 2.9.2 is used, does not consider the possibility of a NULL valuePop return value before proceeding with a free operation during initial error checking, which allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted XML document, a different vulnerability than CVE-2015-6838.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.038
EPSS Ranking 87.4%
CVSS Severity
CVSS v3 Score 7.5
CVSS v2 Score 5.0