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Vulnerability record · CVE-2017-12933 · published 18 August 2017

CVE-2017-12933: Php out-of-bounds read vulnerability

Php · Php

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.

9.8 CVSS 3.0 Critical EPSS 6.9% · top 6.1% CWE-125 · Out-of-bounds read
9.8CVSS 3.0 base score, v2 7.5
6.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
18References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://php.net/ChangeLog-5.php Release NotesVendor Advisory
http://php.net/ChangeLog-7.php Release NotesVendor Advisory
http://www.securityfocus.com/bid/99490 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2018:1296
https://bugs.php.net/bug.php?id=74111 Vendor Advisory
https://usn.ubuntu.com/3566-1/
https://usn.ubuntu.com/3566-2/
https://www.debian.org/security/2018/dsa-4080
https://www.debian.org/security/2018/dsa-4081
http://php.net/ChangeLog-5.php Release NotesVendor Advisory
http://php.net/ChangeLog-7.php Release NotesVendor Advisory
http://www.securityfocus.com/bid/99490 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2018:1296
https://bugs.php.net/bug.php?id=74111 Vendor Advisory
https://usn.ubuntu.com/3566-1/
https://usn.ubuntu.com/3566-2/
https://www.debian.org/security/2018/dsa-4080
https://www.debian.org/security/2018/dsa-4081

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2017-12933), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.