CVE-2017-12933

critical

Description

The finish_nested_data function in ext/standard/var_unserializer.re in PHP before 5.6.31, 7.0.x before 7.0.21, and 7.1.x before 7.1.7 is prone to a buffer over-read while unserializing untrusted data. Exploitation of this issue can have an unspecified impact on the integrity of PHP.

References

https://www.debian.org/security/2018/dsa-4081

https://www.debian.org/security/2018/dsa-4080

https://usn.ubuntu.com/3566-2/

https://usn.ubuntu.com/3566-1/

https://bugs.php.net/bug.php?id=74111

https://access.redhat.com/errata/RHSA-2018:1296

http://www.securityfocus.com/bid/99490

http://php.net/ChangeLog-7.php

http://php.net/ChangeLog-5.php

Details

Source: Mitre, NVD

Published: 2017-08-18

Updated: 2025-04-20

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

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

Severity: Critical

EPSS

EPSS: 0.20457