CVE-2025-67735

Netty has a CRLF Injection vulnerability in io.netty.handler.codec.http.HttpRequestEncoder

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.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Netty

Products

Netty

CVE-2025-55163

Netty MadeYouReset HTTP/2 DDoS Vulnerability

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.124.Final and 4.2.4.Final, Netty is vulnerable to MadeYouReset DDoS. This is a logical vulnerability in the HTTP/2 protocol, that uses malformed HTTP/2 control frames in order to break the max concurrent streams limit - which results in resource exhaustion and distributed denial of service. This issue has been patched in versions 4.1.124.Final and 4.2.4.Final.

CVSS 4.0 · 8.2 High EPSS 1.1% KEV · Not listed

Vendors

Netty

Products

Netty

CVE-2024-40642

Absent Input Validation in BinaryHttpParser in the netty incubator codec.bhttp

The netty incubator codec.bhttp is a java language binary http parser. In affected versions the `BinaryHttpParser` class does not properly validate input values thus giving attackers almost complete control over the HTTP requests constructed from the parsed output. Attackers can abuse several issues individually to perform various injection attacks including HTTP request smuggling, desync attacks, HTTP header injections, request queue poisoning, caching attacks and Server Side Request Forgery (SSRF). Attacker could also combine several issues to create well-formed messages for other text-based protocols which may result in attacks beyond the HTTP protocol. The BinaryHttpParser class implements the readRequestHead method which performs most of the relevant parsing of the received request. The data structure prefixes values with a variable length integer value. The parsing code below first gets the lengths of the values from the prefixed variable length integer. After it has all of the lengths and calculates all of the indices, the parser casts the applicable slices of the ByteBuf to String. Finally, it passes these values into a new `DefaultBinaryHttpRequest` object where no further parsing or validation occurs. Method is partially validated while other values are not validated at all. Software that relies on netty to apply input validation for binary HTTP data may be vulnerable to various injection and protocol based attacks. This issue has been addressed in version 0.0.13.Final. Users are advised to upgrade. There are no known workarounds for this vulnerability.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed

Vendors

Netty

Products

Netty-incubator-codec-ohttp

CVE-2024-29025

Netty HttpPostRequestDecoder can OOM

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. The `HttpPostRequestDecoder` can be tricked to accumulate data. While the decoder can store items on the disk if configured so, there are no limits to the number of fields the form can have, an attacher can send a chunked post consisting of many small fields that will be accumulated in the `bodyListHttpData` list. The decoder cumulates bytes in the `undecodedChunk` buffer until it can decode a field, this field can cumulate data without limits. This vulnerability is fixed in 4.1.108.Final.

CVSS 3.1 · 5.3 Medium EPSS 1.4% KEV · Not listed

Vendors

Debian Netty Redhat

Products

Debian Linux Netty Amq Broker and 10 more

CVE-2025-58056

Netty is vulnerable to request smuggling due to incorrect parsing of chunk extensions

Netty is an asynchronous event-driven network application framework for development of maintainable high performance protocol servers and clients. In versions 4.1.124.Final, and 4.2.0.Alpha3 through 4.2.4.Final, Netty incorrectly accepts standalone newline characters (LF) as a chunk-size line terminator, regardless of a preceding carriage return (CR), instead of requiring CRLF per HTTP/1.1 standards. When combined with reverse proxies that parse LF differently (treating it as part of the chunk extension), attackers can craft requests that the proxy sees as one request but Netty processes as two, enabling request smuggling attacks. This is fixed in versions 4.1.125.Final and 4.2.5.Final.

CVSS 4.0 · 2.9 Low EPSS < 1% KEV · Not listed

Vendors

Netty

Products

Netty

CVE-2025-58057

Netty's BrotliDecoder is vulnerable to DoS via zip bomb style attack

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In netty-codec-compression versions 4.1.124.Final and below, and netty-codec versions 4.2.4.Final and below, when supplied with specially crafted input, BrotliDecoder and certain other decompression decoders will allocate a large number of reachable byte buffers, which can lead to denial of service. BrotliDecoder.decompress has no limit in how often it calls pull, decompressing data 64K bytes at a time. The buffers are saved in the output list, and remain reachable until OOM is hit. This is fixed in versions 4.1.125.Final of netty-codec and 4.2.5.Final of netty-codec-compression.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

Netty

Products

Netty

CVE-2025-24970

SslHandler doesn't correctly validate packets which can lead to native crash when using native SSLEngine

Netty, an asynchronous, event-driven network application framework, has a vulnerability starting in version 4.1.91.Final and prior to version 4.1.118.Final. When a special crafted packet is received via SslHandler it doesn't correctly handle validation of such a packet in all cases which can lead to a native crash. Version 4.1.118.Final contains a patch. As workaround its possible to either disable the usage of the native SSLEngine or change the code manually.

CVSS 3.1 · 7.5 High EPSS 2.2% KEV · Not listed

Vendors

Netapp Netty Redhat

Products

Active Iq Unified Manager Oncommand Insight Netty and 9 more

CVE-2024-47535

Denial of Service attack on windows app using Netty

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. An unsafe reading of environment file could potentially cause a denial of service in Netty. When loaded on an Windows application, Netty attempts to load a file that does not exist. If an attacker creates such a large file, the Netty application crashes. This vulnerability is fixed in 4.1.115.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed

Vendors

Microsoft Netty Redhat

Products

Windows Netty Amq Streams and 2 more

CVE-2025-25193

Denial of Service attack on windows app using Netty

Netty, an asynchronous, event-driven network application framework, has a vulnerability in versions up to and including 4.1.118.Final. An unsafe reading of environment file could potentially cause a denial of service in Netty. When loaded on an Windows application, Netty attempts to load a file that does not exist. If an attacker creates such a large file, the Netty application crash. A similar issue was previously reported as CVE-2024-47535. This issue was fixed, but the fix was incomplete in that null-bytes were not counted against the input limit. Commit d1fbda62d3a47835d3fb35db8bd42ecc205a5386 contains an updated fix.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed

Vendors

Microsoft Netty Redhat

Products

Windows Netty Amq Streams and 1 more

CVE-2022-24823

Local Information Disclosure Vulnerability in io.netty:netty-codec-http

Netty is an open-source, asynchronous event-driven network application framework. The package `io.netty:netty-codec-http` prior to version 4.1.77.Final contains an insufficient fix for CVE-2021-21290. When Netty's multipart decoders are used local information disclosure can occur via the local system temporary directory if temporary storing uploads on the disk is enabled. This only impacts applications running on Java version 6 and lower. Additionally, this vulnerability impacts code running on Unix-like systems, and very old versions of Mac OSX and Windows as they all share the system temporary directory between all users. Version 4.1.77.Final contains a patch for this vulnerability. As a workaround, specify one's own `java.io.tmpdir` when starting the JVM or use DefaultHttpDataFactory.setBaseDir(...) to set the directory to something that is only readable by the current user.

CVSS 3.1 · 5.5 Medium EPSS 1.0% KEV · Not listed

Vendors

Netapp Netty Oracle and 1 more

Products

Active Iq Unified Manager Oncommand Workflow Automation Snapcenter and 7 more

CVE-2016-4970

netty: Infinite loop vulnerability when handling renegotiation using SslProvider.OpenSsl

handler/ssl/OpenSslEngine.java in Netty 4.0.x before 4.0.37.Final and 4.1.x before 4.1.1.Final allows remote attackers to cause a denial of service (infinite loop).

CVSS 3.1 · 7.5 High EPSS 11.3% KEV · Not listed

Vendors

Apache Netty Redhat

Products

Cassandra Netty Jboss Amq and 3 more

CVE-2015-2156

netty: HttpOnly cookie bypass

Netty before 3.9.8.Final, 3.10.x before 3.10.3.Final, 4.0.x before 4.0.28.Final, and 4.1.x before 4.1.0.Beta5 and Play Framework 2.x before 2.3.9 might allow remote attackers to bypass the httpOnly flag on cookies and obtain sensitive information by leveraging improper validation of cookie name and value characters.

CVSS 3.0 · 7.5 High EPSS 5.2% KEV · Not listed

Vendors

Lightbend Netty Playframework

Products

Play Framework Netty Play Framework

CVE-2014-3488

Netty: DoS by CPU exhaustion when using malicious SSL packets

The SslHandler in Netty before 3.9.2 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a crafted SSLv2Hello message.

CVSS 2.0 · 5.0 Medium EPSS 4.2% KEV · Not listed

Vendors

Netty

Products

Netty

CVE-2014-0193

netty: DoS via memory exhaustion during data aggregation

WebSocket08FrameDecoder in Netty 3.6.x before 3.6.9, 3.7.x before 3.7.1, 3.8.x before 3.8.2, 3.9.x before 3.9.1, and 4.0.x before 4.0.19 allows remote attackers to cause a denial of service (memory consumption) via a TextWebSocketFrame followed by a long stream of ContinuationWebSocketFrames.

CVSS 2.0 · 5.0 Medium EPSS 4.3% KEV · Not listed

Vendors

Netty Redhat

Products

Netty Jboss Amq Jboss Bpms and 7 more

CVE-2023-34462

netty-handler SniHandler 16MB allocation

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. The `SniHandler` can allocate up to 16MB of heap for each channel during the TLS handshake. When the handler or the channel does not have an idle timeout, it can be used to make a TCP server using the `SniHandler` to allocate 16MB of heap. The `SniHandler` class is a handler that waits for the TLS handshake to configure a `SslHandler` according to the indicated server name by the `ClientHello` record. For this matter it allocates a `ByteBuf` using the value defined in the `ClientHello` record. Normally the value of the packet should be smaller than the handshake packet but there are not checks done here and the way the code is written, it is possible to craft a packet that makes the `SslClientHelloHandler`. This vulnerability has been fixed in version 4.1.94.Final.

CVSS 3.1 · 6.5 Medium EPSS 2.5% KEV · Not listed

Vendors

Netty Redhat

Products

Netty Amq Broker Amq Clients and 8 more

CVE-2024-36121

netty-incubator-codec-ohttp's BoringSSLAEADContext Repeats Nonces

netty-incubator-codec-ohttp is the OHTTP implementation for netty. BoringSSLAEADContext keeps track of how many OHTTP responses have been sent and uses this sequence number to calculate the appropriate nonce to use with the encryption algorithm. Unfortunately, two separate errors combine which would allow an attacker to cause the sequence number to overflow and thus the nonce to repeat.

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed

Vendors

Netty

Products

Netty-incubator-codec-ohttp

CVE-2020-7238

netty: HTTP Request Smuggling due to Transfer-Encoding whitespace mishandling

Netty 4.1.43.Final allows HTTP Request Smuggling because it mishandles Transfer-Encoding whitespace (such as a [space]Transfer-Encoding:chunked line) and a later Content-Length header. This issue exists because of an incomplete fix for CVE-2019-16869.

CVSS 3.1 · 7.5 High EPSS 3.5% KEV · Not listed

Vendors

Debian Fedoraproject Netty and 1 more

Products

Debian Linux Fedora Netty and 17 more

CVE-2020-11612

netty: compression/decompression codecs don't enforce limits on buffer allocation sizes

The ZlibDecoders in Netty 4.1.x before 4.1.46 allow for unbounded memory allocation while decoding a ZlibEncoded byte stream. An attacker could send a large ZlibEncoded byte stream to the Netty server, forcing the server to allocate all of its free memory to a single decoder.

CVSS 3.1 · 7.5 High EPSS 9.2% KEV · Not listed

Vendors

Debian Fedoraproject Netapp and 3 more

Products

Debian Linux Fedora Oncommand Api Services and 23 more