CVE-2017-12933
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (6.94%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 6.94% probability · 94th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- php/php
- Source
- cve@mitre.org
EPSS 6.9% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://php.net/ChangeLog-5.phpRelease Notes, Vendor Advisory
- http://php.net/ChangeLog-7.phpRelease Notes, Vendor Advisory
- http://www.securityfocus.com/bid/99490Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:1296
- https://bugs.php.net/bug.php?id=74111Vendor 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.phpRelease Notes, Vendor Advisory
- http://php.net/ChangeLog-7.phpRelease Notes, Vendor Advisory
- http://www.securityfocus.com/bid/99490Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:1296
- https://bugs.php.net/bug.php?id=74111Vendor 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.