VDB-336586 · CVE-2025-67735 · GHSA-84h7-rjj3-6jx4

Netty up to 4.1.129.Final/4.2.8.Final io.netty.handler.codec.http.HttpRequestEncoder crlf injection

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.8	$0-$5k	0.00

Summaryinfo

A vulnerability described as problematic has been identified in Netty up to 4.1.129.Final/4.2.8.Final. This affects the function io.netty.handler.codec.http.HttpRequestEncoder. Executing a manipulation can lead to crlf injection. This vulnerability is handled as CVE-2025-67735. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Netty up to 4.1.129.Final/4.2.8.Final and classified as critical. This vulnerability affects the function io.netty.handler.codec.http.HttpRequestEncoder. The manipulation with an unknown input leads to a crlf injection vulnerability. The CWE definition for the vulnerability is CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2025-67735 since 12/11/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 278971 (Linux Distros Unpatched Vulnerability : CVE-2025-67735), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.1.129.Final or 4.2.8.Final eliminates this vulnerability.

The vulnerability is also documented in the databases at CNNVD (CNNVD-202512-3127) and Tenable (278971). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

Netty

Version

Website

Product: https://github.com/netty/netty/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.8

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.5
CNA Vector (GitHub_M): 🔒

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Crlf injection
CWE: CWE-93 / CWE-74 / CWE-707
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 278971
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-67735

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Netty 4.1.129.Final/4.2.8.Final

Timelineinfo

12/11/2025 CVE reserved
12/16/2025 +5 days Advisory disclosed
12/16/2025 +0 days VulDB entry created
12/19/2025 +3 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-84h7-rjj3-6jx4
Status: Confirmed

CVE: CVE-2025-67735 (🔒)
GCVE (CVE): GCVE-0-2025-67735
GCVE (VulDB): GCVE-100-336586
CNNVD: CNNVD-202512-3127 - Netty 注入漏洞

Entryinfo

Created: 12/16/2025 05:53
Updated: 12/19/2025 21:25
Changes: 12/16/2025 05:53 (64), 12/17/2025 16:36 (6), 12/19/2025 21:25 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.