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CVE-2020-17496

CriticalPublished

vBulletin PHP Module Remote Code Execution Vulnerability

Published: Aug 12, 2020
Updated: Oct 21, 2025
Assigning CNA: mitre
Evidence observed: Nov 3, 2021

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

87.7%

High · next 30 days

Percentile: 99.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

vBulletin 5.5.4 through 5.6.2 allows remote command execution via crafted subWidgets data in an ajax/render/widget_tabbedcontainer_tab_panel request. NOTE: this issue exists because of an incomplete fix for CVE-2019-16759.

Sources

CVE-2020-17496PoC
Proof-of-concept exploit for vBulletin pre-auth remote code execution vulnerabilities (CVE-2020-17496, CVE-2019-16759) via widget PHP template injection.
vBulletin_5.x-tab_panel-RCEExploit
(CVE-2020-17496) vBulletin 5.x Widget_tabbedcontainer_tab_panel RCE Vuln Test script

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