CVE-2016-4970

highpriority · track · 34EPSS 0.113 · 96 %ileEUUS

grimoire priorityP1 · Urgent

Exploitable?

—

no known exploitation

Likely / severe?

11.3% (96th) EPSS

CVSS 7.8 · high

Is it mine?

10 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

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).

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedRed Hat JBoss A-MQ 6.3redhat_csaf
The References section of this erratum contains a download link (you must log in to download the update).
https://access.redhat.com/errata/RHSA-2017:0179
FixedRed Hat JBoss Fuse 6.3redhat_csaf
The References section of this erratum contains a download link (you must log in to download the update).
https://access.redhat.com/errata/RHSA-2017:0179

cvss

Technical severity, 0–10. One row per scoring source.

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–high · 3.7–7.8

v2.07.8highAV:N/AC:L/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 10 · impact 6.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:N/A:Psecondary · Red Hat Product Security US

v3.03.7lowCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · Red Hat Product Security US

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-835USprimaryCWE-835USCWE-835US

affected products (10)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
apache cassandra= 3.11.4nvdUScpe:2.3:a:apache:cassandra:*:*:*:*:*:*:*:*
netty netty4.0.20 → 4.0.37nvdUScpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
netty netty4.1.0 → 4.1.1nvdUScpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
redhat jboss data grid= 7.1nvdUScpe:2.3:a:redhat:jboss_data_grid:*:*:*:*:*:*:*:*
redhat jboss middleware text-only advisories= 1.0nvdUScpe:2.3:a:redhat:jboss_middleware_text-only_advisories:*:*:*:*:*:*:*:*
Maven io.netty:netty-handler4.0.0.Alpha1 → 4.0.37.FinalosvUSpkg:maven/io.netty/netty-handler
Maven io.netty:netty-handler4.1.0.Beta1 → 4.1.1.FinalosvUSpkg:maven/io.netty/netty-handler
Red Hat JBoss A-MQ 6.3all versionsfixedredhat_csafUScpe:/a:redhat:jboss_amq:6.3
Red Hat JBoss Fuse 6.3all versionsfixedredhat_csafUScpe:/a:redhat:jboss_fuse:6.3

advisories (2)

Vendor and ecosystem advisories describing this.

RHSA-2017:0179Red Hat Security Advisory: Red Hat JBoss Fuse/A-MQ 6.3 security and bug fix update2017-01-19csaf · redhat_csafUS
Red Hat JBoss Fuse and A-MQ 6.3 Rollup 1, which fixes one security issue and includes several bug fixes, is now available from the Red Hat Customer Portal. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
GHSA-rv63-gqm8-9w8qLoop with Unreachable Exit Condition in Netty2022-05-13ghsa · osvUS
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).

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv redhat_csaf NVD CVE.org MITRE

published 2017-04-13modified 2026-06-17

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references (30)

External citations — patches, advisories, analysis.

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