Is port 445 (SMB) dangerous?

Port 445 is classified as high risk. It is a common target for automated scanning and brute-force attacks. Restrict access to trusted IPs if exposure is necessary.

Should port 445 be open on my firewall?

Port 445 should only be open with strict firewall rules whitelisting trusted IP addresses. Enable rate limiting and intrusion detection systems.

What transport protocol does port 445 use?

Port 445 (SMB) uses the TCP transport protocol and falls under the File Transfer category.

:445 (TCP)

SMB

High 风险

TCP — File Transfer

端口概览

端口号 445

服务名称 SMB

传输协议 TCP

类别 File Transfer

安全风险 High

端口范围知名端口 (0-1023)

什么是端口 445?

Server Message Block. Provides shared access to files, printers, and serial ports over a network. Direct hosting of SMB over TCP without NetBIOS. Targeted by WannaCry and EternalBlue.

TCP File Transfer 常用

安全注意事项

端口445（SMB）被归类为高风险。此端口是自动扫描和暴力破解攻击的常见目标。如必须暴露，请将访问限制为已知IP地址。

建议：使用防火墙规则将可信IP列入白名单。启用速率限制和入侵检测。

SMB

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端口概览

什么是端口 445?

安全注意事项

相关端口 — File Transfer

相关术语