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CVE-2025-67735— Netty has a CRLF Injection vulnerability in io.netty.handler.codec.http.HttpRequestEncoder

Quick assessment

Affected
netty netty
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netty是Netty社区的一款非阻塞I/O客户端-服务器框架，它主要用于开发Java网络应用程序，如协议服务器和客户端等。 Netty 4.1.129.Final之前版本和4.2.8.Final之前版本存在注入漏洞，该漏洞源于HttpRequestEncoder存在CRLF注入问题，可能导致请求夹带攻击。

CVSS 6.5 · Medium EPSS 0.32% · P23
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I. Basic Information for CVE-2025-67735

Vulnerability Information
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Vulnerability Title
Netty has a CRLF Injection vulnerability in io.netty.handler.codec.http.HttpRequestEncoder
Source: CVE Program / CVE List V5
Vulnerability Description
Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.129.Final and 4.2.8.Final, the `io.netty.handler.codec.http.HttpRequestEncoder` has a CRLF injection with the request URI when constructing a request. This leads to request smuggling when `HttpRequestEncoder` is used without proper sanitization of the URI. Any application / framework using `HttpRequestEncoder` can be subject to be abused to perform request smuggling using CRLF injection. Versions 4.1.129.Final and 4.2.8.Final fix the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Netty 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netty是Netty社区的一款非阻塞I/O客户端-服务器框架，它主要用于开发Java网络应用程序，如协议服务器和客户端等。 Netty 4.1.129.Final之前版本和4.2.8.Final之前版本存在注入漏洞，该漏洞源于HttpRequestEncoder存在CRLF注入问题，可能导致请求夹带攻击。
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
netty netty >= 4.2.0.Alpha1, < 4.2.8.Final -

II. Public POCs for CVE-2025-67735

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III. Intelligence Information for CVE-2025-67735

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Vendor Advisories for CVE-2025-67735 (1)

IV. Related Vulnerabilities

Same product: netty
Same vendor: netty
Same weakness: CWE-93

V. Comments for CVE-2025-67735

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