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Fencer Intel
high 7.5

CVE-2016-4970 in the critical feed json

Loop with Unreachable Exit Condition in Netty

published 2017-04-13 9 y ago modified 2026-06-17 4 mo ago also GHSA-rv63-gqm8-9w8q , EUVD-2022-5233

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
11.3%
EPSS 11.3% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

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).

Patch / fix

  • maven io.netty:netty-handler 4.0.37.Final, 4.1.1.Final
  • netty netty 4.0.37, 4.1.1
  • netty Debian 14, Debian 13, Debian 12 1:4.0.37-1

debian advisories DEBIAN-CVE-2016-4970

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-4970 updated cvss 3.7

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

  • Red Hat JBoss Enterprise Application Platform 7 io.projectreactor.netty-reactor-netty
    affected: no fix planned “Will not fix”
  • Red Hat JBoss Fuse 6 camel-netty4-http
    affected: no fix available
  • Red Hat JBoss Operations Network 3 io.projectreactor.netty-reactor-netty
    affected: no fix planned “Will not fix”
  • Red Hat Fuse 7.7.0
    fixed: vendor fix RHSA-2020:3192
  • Red Hat JBoss A-MQ 6.3
    fixed: vendor fix RHSA-2017:0179
  • Red Hat JBoss Data Grid 7.1
    fixed: vendor fix RHSA-2017:1097
  • Red Hat JBoss Fuse 6.3
    fixed: vendor fix RHSA-2017:0179
  • Red Hat BPM Suite 6 io.projectreactor.netty-reactor-netty Red Hat Enterprise Linux OpenStack Platform 7 (Kilo) Operational Tools netty Red Hat JBoss BRMS 6 io.projectreactor.netty-reactor-netty Red Hat JBoss Data Virtualization 6 io.projectreactor.netty-reactor-netty Red Hat JBoss Enterprise Application Platform 6 io.projectreactor.netty-reactor-netty Red Hat JBoss Fuse Service Works 6 io.projectreactor.netty-reactor-netty
    +7 more products
    Red Hat OpenShift Enterprise 2 netty Red Hat OpenStack Platform 8 (Liberty) opendaylight Red Hat OpenStack Platform 9 (Mitaka) opendaylight Red Hat OpenStack Platform 10 (Newton) opendaylight Red Hat Satellite 6 netty Red Hat Software Collections thermostat1-netty, rh-java-common-netty, thermostat1-netty-javadoc, rh-java-common-netty-javadoc Red Hat Subscription Asset Manager netty
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

11.26% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven io.netty:netty-handler
>=4.0.0.Alpha1, <4.0.37.Final
>=4.1.0.Beta1, <4.1.1.Final
4.0.37.Final
4.1.1.Final

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.