Is port 111 (RPCBind / Portmapper) dangerous?

Port 111 is classified as critical risk and should not be exposed to the public internet. It transmits data without encryption, making it vulnerable to eavesdropping and credential theft.

Should port 111 be open on my firewall?

No, port 111 should not be open to the public internet. Block it at the firewall and use encrypted alternatives such as SSH, SFTP, or HTTPS instead.

What transport protocol does port 111 use?

Port 111 (RPCBind / Portmapper) uses the TCP/UDP transport protocol and falls under the System & Infrastructure category.

:111 (TCP/UDP)

RPCBind / Portmapper

Critical 风险

TCP/UDP — System & Infrastructure

端口概览

端口号 111

服务名称 RPCBind / Portmapper

传输协议 TCP/UDP

类别 System & Infrastructure

安全风险 Critical

端口范围知名端口 (0-1023)

什么是端口 111?

RPCBind (also called portmapper) maps ONC RPC program numbers to the dynamic ports on which those services are listening. Exposing port 111 on the internet is a well-known critical vulnerability.

TCP/UDP System & Infrastructure 常用

安全注意事项

端口111（RPCBind / Portmapper）被归类为严重风险。此端口不应暴露在公网上。该服务在未加密的情况下传输数据，容易受到窃听、凭据窃取和中间人攻击。

建议：在防火墙处封锁此端口。改用加密替代方案（SSH、SFTP、HTTPS）。

RPCBind / Portmapper

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端口概览

什么是端口 111?

安全注意事项

相关端口 — System & Infrastructure

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