CVE-2017-12933

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.

Category

9.8
CVSS
Severity: Critical
CVSS 3.0 •
CVSS 2.0 •
EPSS 18.71% Top 10%
Vendor Advisory redhat.com Vendor Advisory debian.org Vendor Advisory debian.org Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory php.net Vendor Advisory php.net Vendor Advisory php.net
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2018:1296 vendor advisory
http://php.net/ChangeLog-5.php release notes vendor advisory
https://bugs.php.net/bug.php?id=74111 vendor advisory
https://www.debian.org/security/2018/dsa-4081 vendor advisory
https://www.debian.org/security/2018/dsa-4080 vendor advisory
https://usn.ubuntu.com/3566-1/ vendor advisory
http://php.net/ChangeLog-7.php release notes vendor advisory
http://www.securityfocus.com/bid/99490 vdb entry third party advisory
https://usn.ubuntu.com/3566-2/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2017-12933?
CVE-2017-12933 has been scored as a critical severity vulnerability.
How to fix CVE-2017-12933?
To fix CVE-2017-12933, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-12933 being actively exploited in the wild?
It is possible that CVE-2017-12933 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~19% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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