The object_common1 function in ext/standard/var_unserializer.c in PHP before 5.6.30, 7.0.x before 7.0.15, and 7.1.x before 7.1.1 allows remote attackers to cause a denial of service (buffer over-read and application crash) via crafted serialized data that is mishandled in a finish_nested_data call.
http://php.net/ChangeLog-5.php
http://php.net/ChangeLog-7.php
http://www.debian.org/security/2017/dsa-3783
http://www.securityfocus.com/bid/95768
http://www.securitytracker.com/id/1037659
https://access.redhat.com/errata/RHSA-2018:1296
https://bugs.php.net/bug.php?id=73825
https://github.com/php/php-src/commit/16b3003ffc6393e250f069aa28a78dc5a2c064b2
https://security.gentoo.org/glsa/201702-29
Source: MITRE
Published: 2017-01-24
Updated: 2018-05-04
Type: CWE-125
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH