Vulnerability Details CVE-2016-4538
The bcpowmod function in ext/bcmath/bcmath.c in PHP before 5.5.35, 5.6.x before 5.6.21, and 7.x before 7.0.6 modifies certain data structures without considering whether they are copies of the _zero_, _one_, or _two_ global variable, which allows remote attackers to cause a denial of service or possibly have unspecified other impact via a crafted call.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.065
EPSS Ranking 90.6%
CVSS Severity
CVSS v3 Score 9.8
CVSS v2 Score 7.5