CVE-2022-29169— ReDoS on endpoint html5client/useragent in BigBlueButton
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I. Basic Information for CVE-2022-29169
Vulnerability Information
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Vulnerability Title
ReDoS on endpoint html5client/useragent in BigBlueButton
Source: NVD (National Vulnerability Database)
Vulnerability Description
BigBlueButton is an open source web conferencing system. Versions starting with 2.2 and prior to 2.3.19, 2.4.7, and 2.5.0-beta.2 are vulnerable to regular expression denial of service (ReDoS) attacks. By using specific a RegularExpression, an attacker can cause denial of service for the bbb-html5 service. The useragent library performs checking of device by parsing the input of User-Agent header and lets it go through lookupUserAgent() (alias of useragent.lookup() ). This function handles input by regexing and attackers can abuse that by providing some ReDos payload using `SmartWatch`. The maintainers removed `htmlclient/useragent` from versions 2.3.19, 2.4.7, and 2.5.0-beta.2. As a workaround, disable NginX forwarding the requests to the handler according to the directions in the GitHub Security Advisory.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
BigBlueButton 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BigBlueButton是BigBlueButton社区的一套开源的Web会议系统。 BigBlueButton 2.2 到 2.3.19、2.4.7 和 2.5.0-beta.2 之前版本存在输入验证错误漏洞，该漏洞源于容易受到正则表达式拒绝服务 (ReDoS) 攻击。攻击者利用该漏洞可以通过使用特定的正则表达式对 bbb-html5 服务造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| bigbluebutton | bigbluebutton | >= 2.2, < 2.3.19 | - |
II. Public POCs for CVE-2022-29169
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://github.com/bigbluebutton/bigbluebutton/pull/14886x_refsource_MISC
- https://github.com/bigbluebutton/bigbluebutton/pull/14896x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2022-29169
Same Patch Batch · bigbluebutton · 2022-06-01 · 6 CVEs total
| CVE-2022-29232 | 6.5 MEDIUM | Exposure of messages in BigBlueButton public chats |
| CVE-2022-29235 | 5.3 MEDIUM | Limited data exposure for shared external videos in BigBlueButton |
| CVE-2022-29233 | 4.3 MEDIUM | Improper access control for breakout rooms in BigBlue Button |
| CVE-2022-29234 | 4.3 MEDIUM | Grace period for lock settings in public/private chats in BigBlueButton |
| CVE-2022-29236 | 4.3 MEDIUM | Improper access control for pencil annotations in BigBlueButton |
IV. Related Vulnerabilities
Same product: bigbluebutton
- CVE-2026-41127
BigBlueButton's missing authorization allows viewer to injec - CVE-2026-41126
BigBlueButton has Open Redirect through bigbluebutton/api/jo - CVE-2026-27736
BigBlueButton has Open Redirect vulnerability in ApiControll - CVE-2026-27467
BigBlueButton: Audio from participants to the server initial - CVE-2026-27466
BigBlueButton: Exposed ClamAV port enables Denial of Service
Same vendor: bigbluebutton
- CVE-2026-41127
BigBlueButton's missing authorization allows viewer to injec - CVE-2026-41126
BigBlueButton has Open Redirect through bigbluebutton/api/jo - CVE-2026-27736
BigBlueButton has Open Redirect vulnerability in ApiControll - CVE-2026-27467
BigBlueButton: Audio from participants to the server initial - CVE-2026-27466
BigBlueButton: Exposed ClamAV port enables Denial of Service
Same weakness: CWE-20
V. Comments for CVE-2022-29169
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