CVE-2016-4538

Severity CVSS v4.0:

Pending analysis

Type:

CWE-20 Input Validation

Publication date:

22/05/2016

Last modified:

12/04/2025

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.

Impact

Vector 3.x

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 9.80 CRITICAL
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

9.80

Severity 3.x

CRITICAL

Vector 2.0

AV:N/AC:L/Au:N/C:P/I:P/A:P CVSS v2.0 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): Physical
Integrity (I): Physical
Availability (A): Physical

Base Score 2.0

7.50

Severity 2.0

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:php:php::::::::		5.5.33 (including)
cpe:2.3:a:php:php:5.6.0:::::::*
cpe:2.3:a:php:php:5.6.1:::::::*
cpe:2.3:a:php:php:5.6.2:::::::*
cpe:2.3:a:php:php:5.6.3:::::::*
cpe:2.3:a:php:php:5.6.4:::::::*
cpe:2.3:a:php:php:5.6.5:::::::*
cpe:2.3:a:php:php:5.6.6:::::::*
cpe:2.3:a:php:php:5.6.7:::::::*
cpe:2.3:a:php:php:5.6.8:::::::*
cpe:2.3:a:php:php:5.6.9:::::::*
cpe:2.3:a:php:php:5.6.10:::::::*
cpe:2.3:a:php:php:5.6.11:::::::*
cpe:2.3:a:php:php:5.6.12:::::::*
cpe:2.3:a:php:php:5.6.13:::::::*

To consult the complete list of CPE names with products and versions, see this page

CPE	From	Up to
cpe:2.3:a:php:php::::::::		5.5.33 (including)
cpe:2.3:a:php:php:5.6.0:::::::*
cpe:2.3:a:php:php:5.6.1:::::::*
cpe:2.3:a:php:php:5.6.2:::::::*
cpe:2.3:a:php:php:5.6.3:::::::*
cpe:2.3:a:php:php:5.6.4:::::::*
cpe:2.3:a:php:php:5.6.5:::::::*
cpe:2.3:a:php:php:5.6.6:::::::*
cpe:2.3:a:php:php:5.6.7:::::::*
cpe:2.3:a:php:php:5.6.8:::::::*
cpe:2.3:a:php:php:5.6.9:::::::*
cpe:2.3:a:php:php:5.6.10:::::::*
cpe:2.3:a:php:php:5.6.11:::::::*
cpe:2.3:a:php:php:5.6.12:::::::*
cpe:2.3:a:php:php:5.6.13:::::::*

CVE-2016-4538

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools