CVE-2025-67735
Detail
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.
Metrics
NVD enrichment efforts reference publicly available information to associate
vector strings. CVSS information contributed by other sources is also
displayed.
CVSS 4.0 Severity and Vector Strings:
NVD assessment
not yet provided.
CVSS 3.x Severity and Vector Strings:
Base
Score:
NVD assessment
not yet provided.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS 2.0 Severity and Vector Strings:
Base
Score:
NVD assessment
not yet provided.
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Weakness Enumeration
| CWE-ID |
CWE Name |
Source |
|
CWE-93
|
Improper Neutralization of CRLF Sequences ('CRLF Injection') |
GitHub, Inc.
|
Change History
4 change records found show changes
CVE Modified by CISA-ADP
6/17/2026 5:58:03 AM
| Action |
Type |
Old Value |
New Value |
| Added |
SSVC |
{"timestamp":"2025-12-16T14:26:21.658602Z","id":"CVE-2025-67735","options":[{"exploitation":"poc"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}
|
CVE Modified by GitHub, Inc.
6/17/2026 5:58:03 AM
| Action |
Type |
Old Value |
New Value |
| Added |
Affected |
[{"vendor":"netty","product":"netty","versions":[{"version":">= 4.2.0.Alpha1, < 4.2.8.Final","status":"affected"},{"version":"< 4.1.129.Final","status":"affected"}]}]
|
Initial Analysis by NIST
1/02/2026 1:50:23 PM
| Action |
Type |
Old Value |
New Value |
| Added |
CPE Configuration |
OR
*cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* versions up to (excluding) 4.1.129
*cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* versions from (including) 4.2.0 up to (excluding) 4.2.8
|
| Added |
Reference Type |
GitHub, Inc.: https://github.com/netty/netty/security/advisories/GHSA-84h7-rjj3-6jx4 Types: Exploit, Vendor Advisory
|
New CVE Received from GitHub, Inc.
12/15/2025 8:15:52 PM
| Action |
Type |
Old Value |
New Value |
| Added |
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.
|
| Added |
CVSS V3.1 |
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
|
| Added |
CWE |
CWE-93
|
| Added |
Reference |
https://github.com/netty/netty/security/advisories/GHSA-84h7-rjj3-6jx4
|
Quick Info
CVE Dictionary Entry: CVE-2025-67735 NVD
Published Date: 12/15/2025 NVD
Last Modified: 06/17/2026
Source: GitHub, Inc.
|
