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Fencer Intel
critical 9.8

CVE-2016-6620 json

An issue was discovered in phpMyAdmin.

published 2016-12-11 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-7533

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.2%
EPSS 3.2% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

An issue was discovered in phpMyAdmin. Some data is passed to the PHP unserialize() function without verification that it's valid serialized data. The unserialization can result in code execution because of the interaction with object instantiation and autoloading. All 4.6.x versions (prior to 4.6.4), 4.4.x versions (prior to 4.4.15.8), and 4.0.x versions (prior to 4.0.10.17) are affected.

Patch / fix

  • phpmyadmin Debian 14, Debian 13, Debian 12 4:4.6.4+dfsg1-1

debian advisories DEBIAN-CVE-2016-6620

  • phpMyAdmin openSUSE Tumbleweed 4.6.5.2-1.1

opensuse advisories openSUSE-SU-2024:10054-1

  • phpmyadmin Alpine 3.2 4.4.15.8-r0

alpine advisories ALPINE-CVE-2016-6620

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-6620 updated

phpMyAdmin: Multiple vulnerabilities fixed in 4.0.10.18, 4.4.15.9 and 4.6.5 versions

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.19% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.