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Fencer Vulns
high 7.5

CVE-2020-11612 json

Denial of Service in Netty

published 2020-04-07 6 y ago modified 2026-06-17 4 mo ago also GHSA-mm9x-g8pc-w292 , EUVD-2020-0500

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
9.2%
EPSS 9.2% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

The ZlibDecoders in Netty 4.1.x before 4.1.46 allow for unbounded memory allocation while decoding a ZlibEncoded byte stream. An attacker could send a large ZlibEncoded byte stream to the Netty server, forcing the server to allocate all of its free memory to a single decoder.

Patch / fix

  • maven io.netty:netty-handler 4.1.46
  • netty netty 4.1.46
  • oracle nosql_database 20.3
  • oracle siebel_core_-_server_framework 21.5
  • netty Debian 14, Debian 13, Debian 12 1:4.1.48-1

debian advisories DEBIAN-CVE-2020-11612

  • netty Ubuntu 18.04 LTS 1:4.1.7-4ubuntu0.1
  • netty Ubuntu Pro 16.04 LTS 1:4.0.34-1ubuntu0.1~esm1
  • netty Ubuntu Pro 20.04 LTS 1:4.1.45-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2020-11612

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • tfm satellite capsule 6.9, satellite 6.9 6.1-4.el7sat
  • kobo satellite capsule 6.9, satellite 6.9 0.5.1-1.el7sat
  • pulp satellite capsule 6.9, satellite 6.9 2.21.5-2.el7sat
  • gofer satellite capsule 6.9, satellite 6.9 2.12.5-7.el7sat
  • future satellite capsule 6.9, satellite 6.9 0.16.0-11.el7sat
  • ostree satellite capsule 6.9, satellite 6.9 2017.1-2.atomic.el7
  • foreman satellite capsule 6.9, satellite 6.9 2.3.1.20-1.el7sat
  • katello satellite capsule 6.9, satellite 6.9 3.18.1-3.el7sat

red hat advisories RHSA-2021:1313RHSA-2020:3463RHSA-2020:3462RHSA-2020:3461RHSA-2020:2605

  • netty Manager Server Module 4.1 4.1.44.Final-150200.3.4.2
  • netty Manager Server Module 4.3 4.1.44.Final-150400.3.3.2
  • netty Manager Server Module 4.2 4.1.44.Final-150300.4.3.2

suse advisories SUSE-SU-2022:3793-1SUSE-SU-2022:3760-1SUSE-SU-2022:3617-1

  • netty openSUSE Tumbleweed 4.1.60-1.4

opensuse advisories openSUSE-SU-2024:11085-1

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-2020-11612 updated cvss 7.5

netty: compression/decompression codecs don't enforce limits on buffer allocation sizes

  • Red Hat Fuse 7 karaf-transaction-manager-narayana karaf-transaction-manager-narayana
    affected: no fix available
  • Red Hat JBoss A-MQ 6 netty netty Red Hat JBoss Enterprise Application Platform 5 netty netty Red Hat JBoss Enterprise Application Platform 6 netty netty Red Hat JBoss Fuse 6 netty netty Red Hat JBoss Operations Network 3 netty netty
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Application Runtimes netty netty
    affected: no fix available
  • Red Hat OpenShift Container Platform 3.11 openshift3/ose-logging-elasticsearch5 Red Hat OpenShift Container Platform 4 openshift4/ose-logging-elasticsearch5
    affected: no fix planned “Will not fix”
  • Red Hat EAP-CD 20 Tech Preview
    fixed: vendor fix RHSA-2020:3585
  • Red Hat AMQ
    fixed: vendor fix RHSA-2020:2751
  • Red Hat AMQ Clients 2 nodejs-rhea 1.0.21-1.el8, qpid-cpp 1.39.0-5.el8amq, qpid-proton 0.31.0-3.el7, qpid-proton 0.31.0-3.el8, qpid-cpp 1.36.0-30.el7amq, qpid-proton-c 0.31.0-3.el7, +18 more
    fixed: vendor fix RHSA-2020:2605
  • Red Hat AMQ Online 1.4.1 GA
    fixed: vendor fix RHSA-2020:1538
show 15 more
  • Red Hat AMQ Streams 1.5.0
    fixed: vendor fix RHSA-2020:2618
  • Red Hat build of Quarkus 1.7.5
    fixed: vendor fix RHSA-2020:4252
  • Red Hat Data Grid
    fixed: vendor fix RHSA-2020:3626
  • Red Hat Data Grid 7.3.7
    fixed: vendor fix RHSA-2020:3779
  • Red Hat Decision Manager 7
    fixed: vendor fix RHSA-2020:3196
  • Red Hat Fuse 7.8.0
    fixed: vendor fix RHSA-2020:5568
  • Red Hat JBoss EAP 7.3 for BaseOS-8 eap7-dom4j 2.1.3-1.redhat_00001.1.el8eap, eap7-wildfly 7.3.2-4.GA_redhat_00002.1.el8eap, eap7-netty 4.1.48-1.Final_redhat_00001.1.el8eap, eap7-jackson-core 2.10.4-1.redhat_00001.1.el8eap, eap7-undertow 2.0.30-4.SP4_redhat_00001.1.el8eap, eap7-hibernate 5.3.17-1.Final_redhat_00001.1.el8eap, +75 more
    fixed: vendor fix RHSA-2020:3463
  • Red Hat JBoss EAP 7.3 for RHEL 6 Server eap7-netty 4.1.48-1.Final_redhat_00001.1.el6eap, eap7-netty-all 4.1.48-1.Final_redhat_00001.1.el6eap
    fixed: vendor fix RHSA-2020:3461
  • Red Hat JBoss EAP 7.3 for RHEL 7 Server eap7-dom4j 2.1.3-1.redhat_00001.1.el7eap, eap7-wildfly 7.3.2-4.GA_redhat_00002.1.el7eap, eap7-netty 4.1.48-1.Final_redhat_00001.1.el7eap, eap7-jackson-core 2.10.4-1.redhat_00001.1.el7eap, eap7-undertow 2.0.30-4.SP4_redhat_00001.1.el7eap, eap7-hibernate 5.3.17-1.Final_redhat_00001.1.el7eap, +77 more
    fixed: vendor fix RHSA-2020:3462
  • Red Hat JBoss Enterprise Application Platform 7
    fixed: vendor fix RHSA-2020:3464
  • Red Hat Process Automation 7
    fixed: vendor fix RHSA-2020:3197
  • Red Hat Satellite 6.9 candlepin 3.1.26-1.el7sat, candlepin-selinux 3.1.26-1.el7sat
    fixed: vendor fix RHSA-2021:1313
  • Red Hat Single Sign-On 7.4.2
    fixed: vendor fix RHSA-2020:3501
  • Red Hat Text-Only RHOAR
    fixed: vendor fix RHSA-2020:1422
  • Red Hat JBoss EAP 7.3 for RHEL 6 Server eap7-dom4j 2.1.3-1.redhat_00001.1.el6eap, eap7-wildfly 7.3.2-4.GA_redhat_00002.1.el6eap, eap7-jackson-core 2.10.4-1.redhat_00001.1.el6eap, eap7-undertow 2.0.30-4.SP4_redhat_00001.1.el6eap, eap7-hibernate 5.3.17-1.Final_redhat_00001.1.el6eap, eap7-elytron-web 1.6.2-1.Final_redhat_00001.1.el6eap, +73 more Red Hat Satellite 6.9 tfm 6.1-4.el7sat, kobo 0.5.1-1.el7sat, pulp 2.21.5-2.el7sat, gofer 2.12.5-7.el7sat, libsolv 0.7.12-2.el7pc, receptor 0.6.3-1.el7ar, +637 more Red Hat Satellite Capsule 6.9 tfm 6.1-4.el7sat, kobo 0.5.1-1.el7sat, pulp 2.21.5-2.el7sat, gofer 2.12.5-7.el7sat, libsolv 0.7.12-2.el7pc, future 0.16.0-11.el7sat, +238 more
    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

9.19% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

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 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
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
>=4.1.0, <4.1.46
4.1.46

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns 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.