是什么
文件共享端口：SMB、NFS、FTP、rsync。
为何有风险
暴露到互联网会成为勒索软件扩散与数据泄露的通道；SMB 长期是蠕虫（EternalBlue 一类）的目标。
应对措施
限制在内网／VPN，采用最小权限共享并保持打补丁，用 SFTP 取代 FTP。
您的服务器是否在监听？
Linux
ss -ltnp 'sport = :21'FTP 的已知漏洞
| CVE | 标题 | CVSS | 被利用 | EPSS | 发布日期 |
|---|---|---|---|---|---|
| CVE-2011-2523 | vsftpd 2.3.4 downloaded between 20110630 and 20110703 contains a backdoor which opens a shell on port 6200/tcp... | 9.8 | — | 2019-11-27 | |
| CVE-2021-30047 | VSFTPD 3.0.3 allows attackers to cause a denial of service due to limited number of connections allowed. | 7.5 | — | 2023-08-22 | |
| CVE-2021-3618 | ALPACA is an application layer protocol content confusion attack, exploiting TLS servers implementing differen... | 7.4 | 2.0% | 2022-03-23 | |
| CVE-2015-1419 | Unspecified vulnerability in vsftpd 3.0.2 and earlier allows remote attackers to bypass access restrictions vi... | 5.0 | — | 2015-01-28 | |
| CVE-2011-0762 | The vsf_filename_passes_filter function in ls.c in vsftpd before 2.3.3 allows remote authenticated users to ca... | 4.0 | — | 2011-03-02 |