Description
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.
Remediation
References
Related Vulnerabilities
WordPress Plugin WPFront Scroll Top Cross-Site Scripting (2.0.6.07225)
WordPress Plugin WP Vault Local File Inclusion (0.8.6.6)
WordPress Plugin Divi Builder Cross-Site Scripting (2.17.2)
Oracle Application Server Other Vulnerability (CVE-2002-0561)
WordPress 4.9.x Cross-Domain Flash Injection Vulnerability (4.9 - 4.9.1)