CVE-2026-27466— BigBlueButton 安全漏洞
一分钟漏洞结论
影响对象
bigbluebutton bigbluebutton
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
BigBlueButton是BigBlueButton社区的一套开源的Web会议系统。 BigBlueButton 3.0.21及之前版本存在安全漏洞，该漏洞源于官方文档中ClamAV配置指令不当，可能导致远程攻击者发起拒绝服务攻击。
可能的 ATT&CK 技术 1 AI
T1496 · Resource Hijacking
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一、 漏洞 CVE-2026-27466 基础信息
漏洞信息
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Vulnerability Title
BigBlueButton: Exposed ClamAV port enables Denial of Service
来源: CVE Program / CVE List V5
Vulnerability Description
BigBlueButton is an open-source virtual classroom. In versions 3.0.21 and below, the official documentation for "Server Customization" on Support for ClamAV as presentation file scanner contains instructions that leave a BBB server vulnerable for Denial of Service. The flawed command exposes both ports (3310 and 7357) to the internet. A remote attacker can use this to send complex or large documents to clamd and waste server resources, or shutdown the clamd process. The clamd documentation explicitly warns about exposing this port. Enabling ufw (ubuntu firewall) during install does not help, because Docker routes container traffic through the nat table, which is not managed or restricted by ufw. Rules installed by ufw in the filter table have no effect on docker traffic. In addition, the provided example also mounts /var/bigbluebutton with write permissions into the container, which should not be required. Future vulnerabilities in clamd may allow attackers to manipulate files in that folder. Users are unaffected unless they have opted in to follow the extra instructions from BigBlueButton's documentation. This issue has been fixed in version 3.0.22.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L
来源: CVE Program / CVE List V5
Vulnerability Type
将资源暴露给错误范围
来源: CVE Program / CVE List V5
Vulnerability Title
BigBlueButton 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
BigBlueButton是BigBlueButton社区的一套开源的Web会议系统。 BigBlueButton 3.0.21及之前版本存在安全漏洞，该漏洞源于官方文档中ClamAV配置指令不当，可能导致远程攻击者发起拒绝服务攻击。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| bigbluebutton | bigbluebutton | < 3.0.22 | - |
|
二、漏洞 CVE-2026-27466 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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IV. Related Vulnerabilities
V. Comments for CVE-2026-27466
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