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MEDIUM severity

CVE-2016-6623 — phpmyadmin

MEDIUM

CVE-2016-6623 is a medium-severity (CVSS 6.5) Improper Input Validation vulnerability in phpmyadmin/phpmyadmin. A fix is available for phpmyadmin/phpmyadmin — see the affected versions and patch details below.

phpMyAdmin DoS Vulnerability

Also known asGHSA-2mcj-3r3r-v5wm
Published
Updated
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Nov 1, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs77th percentile — riskier than 77% of all scored CVEsHighest risk
0.05%0.76%1.48%2.19%0.5%1.7%May 26Aug 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

3 pkgs affected
🐘phpmyadmin/phpmyadmin🐘phpmyadmin/phpmyadmin🐘phpmyadmin/phpmyadmin

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

An issue was discovered in phpMyAdmin. An authorized user can cause a denial-of-service (DoS) attack on a server by passing large values to a loop. 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.

Affected Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistphpmyadmin/phpmyadmin≥ 4.6.0&&< 4.6.44.6.4composer require phpmyadmin/phpmyadmin:^4.6.4
🐘Packagistphpmyadmin/phpmyadmin≥ 4.4.0&&< 4.4.15.84.4.15.8composer require phpmyadmin/phpmyadmin:^4.4.15.8
🐘Packagistphpmyadmin/phpmyadmin≥ 4.0.0&&< 4.0.10.174.0.10.17composer require phpmyadmin/phpmyadmin:^4.0.10.17

Affected Products

1 product · 60 configurations
Application
phpmyadminphpmyadmin
60 versions
4.0.04.0.14.0.24.0.34.0.44.0.4.14.0.4.24.0.54.0.64.0.74.0.84.0.9

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for phpmyadmin/phpmyadmin, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update phpmyadmin/phpmyadmin to 4.6.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2016-6623 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

An issue was discovered in phpMyAdmin. An authorized user can cause a denial-of-service (DoS) attack on a server by passing large values to a loop. 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.
O3 Security · Impact-Aware SCA

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CVE-2016-6623: phpmyadmin DoS — Fixed in 4.6.4