Out-of-bounds Read in PHP
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. Exploitation of this issue can have an unspecified impact on the integrity of PHP.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.069 (93.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 93.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.069 · newest: 0.069 · change: 0.000
Affected products
- PHP — versions 7.0.0, 7.0.1, 7.0.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- access.redhat.com/errata/RHSA-2018:1296 (vendor-advisory)
- php.net/ChangeLog-5.php (Release Notes, Vendor Advisory)
- bugs.php.net/bug.php (Vendor Advisory)
- www.debian.org/security/2018/dsa-4081 (vendor-advisory)
- www.debian.org/security/2018/dsa-4080 (vendor-advisory)
- usn.ubuntu.com/3566-1/ (vendor-advisory)
- php.net/ChangeLog-7.php (Release Notes, Vendor Advisory)
- www.securityfocus.com/bid/99490 (VDB Entry, Third Party Advisory, vdb-entry)
- usn.ubuntu.com/3566-2/ (vendor-advisory)
Frequently asked questions
- What is CVE-2017-12933?
- CVE-2017-12933 is a critical-severity vulnerability in PHP, classified under Out-of-bounds Read. CVSS score: 9.8/10. Published 2017-08-18.
- How severe is CVE-2017-12933?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2017-12933 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.