CVE-2017-12933

Name: CVE-2017-12933
Creator: NVD / NIST
Published: 2017-08-18T03:29:00.23+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 6.94%

Last modified Jun 17, 2026

CVE-2017-12933 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 6.94% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

6.94%

93.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Php	Php	<= 5.6.30
Php	Php	7.0.0
Php	Php	7.0.1
Php	Php	7.0.2
Php	Php	7.0.3
Php	Php	7.0.4
Php	Php	7.0.5
Php	Php	7.0.6
Php	Php	7.0.7
Php	Php	7.0.8
Php	Php	7.0.9
Php	Php	7.0.10
Php	Php	7.0.11
Php	Php	7.0.12
Php	Php	7.0.13
Php	Php	7.0.14
Php	Php	7.0.15
Php	Php	7.0.16
Php	Php	7.0.17
Php	Php	7.0.18
Php	Php	7.0.19
Php	Php	7.0.20
Php	Php	7.1.0
Php	Php	7.1.1
Php	Php	7.1.2
Php	Php	7.1.3
Php	Php	7.1.4
Php	Php	7.1.5
Php	Php	7.1.6

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

Timeline

Published: Aug 18, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-12933?

How severe is CVE-2017-12933?

Severity scoring for CVE-2017-12933 is pending analysis. The EPSS model estimates a 6.94% probability of exploitation in the next 30 days.

How do I fix CVE-2017-12933?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-12933?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST