VULNERABILITY INTELLIGENCE

CVE-2016-4537

CVSS score9.8 CRITICAL

EPSS probability5.72%

CISA KEVNot currently listed

Published2016-05-22

Last modified2026-06-17

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 accepts a negative integer for the scale argument, which allows remote attackers to cause a denial of service or possibly have unspecified other impact via a crafted call.