What’s Vulnerable › Vulnerabilities

CVE-2016-4970

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 11.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-04-13 · updated 2026-06-17
• Weakness: CWE-835

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).

Affected products

• Apache Software Foundation Apache Cassandra: 3.11.4
• netty: from 4.0.20 before 4.0.37; from 4.1.0 before 4.1.1 — fixed in 4.0.37, 4.1.1
• RedHat Jboss Data Grid: 7.1
• RedHat Jboss Middleware Text-Only Advisories: 1.0

How to fix

Upgrade to a fixed version: netty 4.0.37, 4.1.1. Check the vendor advisory for mitigations.

References

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

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