CVE-2015-6835

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

16/05/2016

Last modified:

12/04/2025

Description

The session deserializer in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13 mishandles multiple php_var_unserialize calls, which allow remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via crafted session content.

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:5.6.0:alpha1::::::
cpe:2.3:a:php:php:5.6.0:alpha2::::::
cpe:2.3:a:php:php:5.6.0:alpha3::::::
cpe:2.3:a:php:php:5.6.0:alpha4::::::
cpe:2.3:a:php:php:5.6.0:alpha5::::::
cpe:2.3:a:php:php:5.6.0:beta1::::::
cpe:2.3:a:php:php:5.6.0:beta2::::::
cpe:2.3:a:php:php:5.6.0:beta3::::::
cpe:2.3:a:php:php:5.6.0:beta4::::::
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:::::::*

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:5.6.0:alpha1::::::
cpe:2.3:a:php:php:5.6.0:alpha2::::::
cpe:2.3:a:php:php:5.6.0:alpha3::::::
cpe:2.3:a:php:php:5.6.0:alpha4::::::
cpe:2.3:a:php:php:5.6.0:alpha5::::::
cpe:2.3:a:php:php:5.6.0:beta1::::::
cpe:2.3:a:php:php:5.6.0:beta2::::::
cpe:2.3:a:php:php:5.6.0:beta3::::::
cpe:2.3:a:php:php:5.6.0:beta4::::::
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:::::::*

CVE-2015-6835

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools