CVE-2016-4537

PoC —

CVSS 3.0

9.8 critical

EPSS

6%p93

Published

May 22, 2016 (May 22, 2016)

Modified

Jun 17, 2026

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.

Vendors: php opensuse fedoraproject
Products: php, leap, fedora
Weakness: CWE-20
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (5.9%)

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