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

EPSS: 0.069 (93.4th percentile) — read the EPSS interpretation.

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.

Affected products

  • Php — versions 7.0.0, 7.0.1, 7.0.2
  • N/a — versions n/a

Weakness classification (CWE)

Public proof-of-concept exploits

References

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.