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CVE-2016-4970

30
FAUCET Score

CVE-2016-4970 is a denial-of-service vulnerability affecting Netty versions 4.0.x before 4.0.37.Final and 4.1.x before 4.1.1.Final, specifically within the OpenSslEngine.java component. This vulnerability, rated as High severity (CVSS 7.5), allows remote, unauthenticated attackers to trigger an infinite loop, leading to service disruption. While no active exploitation, public exploit code, or significant community discussion has been observed, its potential for a complete denial of service warrants attention.

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.0.20, < 4.0.37CPE matchmatch criteria
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
>= 4.1.0, < 4.1.1CPE matchmatch criteria
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
7.1CPE matchmatch criteria
cpe:2.3:a:redhat:jboss_data_grid:7.1:*:*:*:*:*:*:*
1.0CPE matchmatch criteria
cpe:2.3:a:redhat:jboss_middleware_text-only_advisories:1.0:*:*:*:*:middleware:*:*
3.11.4CPE matchmatch criteria
cpe:2.3:a:apache:cassandra:3.11.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
11.26%
Probability of exploitation in next 30 days
EPSS Percentile
95.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.1126 is in the 93rd percentile among its peer group of 51,466 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (10)

github_advisorypatch availablevia nvd_reference
View patch
mavenpatch availablevia ghsa
Product: io.netty:netty-handlerFixed in: 4.0.37.Final
mavenpatch availablevia ghsa
Product: io.netty:netty-handlerFixed in: 4.1.1.Final
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Fuse 6.3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Data Grid 7.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Fuse 7.7.0Fixed in: netty
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss A-MQ 6.3
View patch
redhatno patchvia redhat_api
Product: Red Hat JBoss Fuse 6Fixed in: camel
redhatend of lifevia redhat_api
Product: Red Hat JBoss Enterprise Application Platform 7Fixed in: netty
redhatend of lifevia redhat_api
Product: Red Hat JBoss Operations Network 3Fixed in: netty

Vendor Advisories (2)

mavenGHSA-rv63-gqm8-9w8qhigh

Loop with Unreachable Exit Condition in Netty

May 13, 2022
redhatCVE-2016-4970Moderate

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

Jun 7, 2016

References

netty.io / news/2016/06/07/4-0-37-Final.html
Release NotesVendor Advisory
netty.io / news/2016/06/07/4-1-1-Final.html
Release NotesVendor Advisory
rhn.redhat.com / errata/RHSA-2017-0179.html
Third Party Advisory
rhn.redhat.com / errata/RHSA-2017-1097.html
Third Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party AdvisoryVDB Entry
github.com / netty/netty/pull/5364
PatchThird Party Advisory
lists.apache.org / thread.html/afaa5860e3a6d327eb96c3d82cbd2f5996de815a16854ed1ad310144%40%3Ccommits.cassandra.apache.org%3E
wiki.opendaylight.org / view/Security_Advisories
Third Party Advisory
securityfocus.com / bid/96540
Third Party AdvisoryVDB Entry