Vulnerability in bcpowmod Function in PHP Allows for Denial of Service or Other Impact

CVE-2016-4538 · HIGH Severity

AV:N/AC:L/AU:N/C:P/I:P/A:P

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.

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