# CVE-2020-11612: Denial of Service in Netty

Source: https://junglewise.ai/threats/cve-2020-11612-denial-of-service-in-netty  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2020-06-15  
License: CC BY 4.0 with a link back

CVE-2020-11612 · Severity: low · CVSS 3.1 · Published 2020-06-15

Denial of Service in Netty

Technologies: [io.netty:netty-handler (Maven)](https://junglewise.ai/threats/technologies/io-netty-netty-handler). Vendors: [Maven](https://junglewise.ai/threats/vendors/maven).

## Quick answers

**Is CVE-2020-11612 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2020-11612 being exploited in the wild.

**How severe is CVE-2020-11612?** Low severity, with a CVSS score of 3.1, published 15 June 2020.

**Which products and versions are affected?** io.netty:netty-handler (Maven) ECOSYSTEM:introduced=4.1.0,fixed=4.1.46.

**Is there a fix for CVE-2020-11612?** Yes. io.netty:netty-handler (Maven): upgrade to 4.1.46 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2020-11612?** Check whether you run io.netty:netty-handler (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- io.netty:netty-handler (Maven): upgrade to 4.1.46 or later

  ```sh
  # set io.netty:netty-handler to 4.1.46 in your pom.xml or build.gradle
  ```


## Affected products

- io.netty:netty-handler (Maven) ECOSYSTEM:introduced=4.1.0,fixed=4.1.46

## Identifiers

- CVE-2020-11612
- GHSA-mm9x-g8pc-w292

## Related threats

- [Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, the default io.netty.handler.](https://junglewise.ai/threats/cve-2026-75596-netty-quadratic-pre-handshake-clienthello-reassembly-in-sni)
- [Netty SNI routing bypass via fragmented TLS ClientHello](https://junglewise.ai/threats/cve-2026-75595-netty-sni-routing-bypass-via-fragmented-tls-clienthello)
- [Netty disabled TLS hostname verification in netty-handler](https://junglewise.ai/threats/cve-2026-50010-netty-disabled-tls-hostname-verification-in-netty-handler)
- [Netty excessive memory allocation in SNIHandler](https://junglewise.ai/threats/cve-2026-45416-netty-excessive-memory-allocation-in-snihandler)
- [Netty IPv6 subnet filter bypass in netty-handler](https://junglewise.ai/threats/cve-2026-44249-netty-ipv6-subnet-filter-bypass-in-netty-handler)