Resource exhaustion in BigBlueButton - CVE-2022-29169
Published: June 2, 2022 / Updated: May 14, 2026
Vulnerability identifier: #VU131446
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2022-29169
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the html5client/useragent endpoint when parsing the User-Agent header. A remote attacker can send a specially crafted request to cause a denial of service.
The issue is triggered by excessive processing in the regular expression engine during device detection.
Affected software
BigBlueButton
How to mitigate CVE-2022-29169
Install security update from vendor's website.
BigBlueButton - addressed in versions 2.3.19, 2.4.7, 2.5.0