CVE-2017-12934
ext/standard/var_unserializer.re in PHP 7.0.x before 7.0.21 and 7.1.x before 7.1.7 is prone to a heap use after free while unserializing untrusted data, related to the zval_get_type function in Zend/zend_types.h.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.63%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
ext/standard/var_unserializer.re in PHP 7.0.x before 7.0.21 and 7.1.x before 7.1.7 is prone to a heap use after free while unserializing untrusted data, related to the zval_get_type function in Zend/zend_types.h. Exploitation of this issue can have an unspecified impact on the integrity of PHP.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 3.63% probability · 89th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- php/php
- Source
- cve@mitre.org
EPSS 3.6% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://php.net/ChangeLog-7.phpVendor Advisory
- http://www.securityfocus.com/bid/100428Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:1296
- https://bugs.php.net/bug.php?id=74101Issue Tracking, Third Party Advisory
- https://www.debian.org/security/2018/dsa-4080
- http://php.net/ChangeLog-7.phpVendor Advisory
- http://www.securityfocus.com/bid/100428Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:1296
- https://bugs.php.net/bug.php?id=74101Issue Tracking, Third Party Advisory
- https://www.debian.org/security/2018/dsa-4080
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.