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CVE-2020-17496: vBulletin PHP Module Remote Code Execution Vulnerability

criticalknown exploitedpublic exploitCVE-2020-17496
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
The PHP module within vBulletin contains an unspecified vulnerability that allows for remote code execution via crafted subWidgets data in an ajax/render/widget_tabbedcontainer_tab_panel request. This CVE ID resolves an incomplete patch for CVE-2019-16759.

CSIRTS triage

vendor: vBulletinproduct: PHP ModuleRemote code execution
What
The PHP module contains a vulnerability allowing remote code execution via crafted data.
Who is affected
Deployments of vBulletin with the PHP module.
Urgency
Remediation is critical due to active exploitation.
Action
Update the vBulletin PHP module to the latest version.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2020-17496

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2020-17496coverage & exploitation statusNVD · CVE.org

Recent advisories for vBulletin PHP Module

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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