Use After Free in PHP

CVE-2016-5773

php_zip.c in the zip extension in PHP before 5.5.37, 5.6.x before 5.6.23, and 7.x before 7.0.8 improperly interacts with the unserialize implementation and garbage collection, which allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free and application crash) via crafted serialized data containing a ZipArchive object.

Vulnerability class: Use-After-Free

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: 0.093 (95.2th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 95.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2016-5773: held from 0.093 to 0.093.

EPSS over last 30 days · oldest: 0.093 · newest: 0.093 · change: 0.000

Affected products

  • PHP — versions 5.6.0, 5.6.1, 5.6.2

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2016-5773?
CVE-2016-5773 is a critical-severity vulnerability in PHP, classified under Use After Free. CVSS score: 9.8/10. Published 2016-08-07.
How severe is CVE-2016-5773?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2016-5773 known to be exploited?
4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.