`CVE-2020-11612` Netty

Affected software	Netty
Severity	7.5 High CVSS 3.1 2 scores
Fixed in	`4.1.46`
Weakness	Buffer errors (CWE-119)
Published	7 Apr 2020
Updated	17 Jun 2026

Description

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.

CWE-770CWE-400 · Uncontrolled resource consumption

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 6 years ago.

CISA KEV not listed
VulnCheck KEV not listed
CISA Vulnrichment no assessment published
Indexed PoC none indexed
EPSS 9.2% chance in 30 days

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

Protection none
Action not pursued none
Review human Researcher
Record active

Decided by	Manual classification of this CVE in the legacy dataset
Finding	A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

Decided by

Manual classification of this CVE in the legacy dataset

Finding

A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

7.5 HIGH v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

Version Score Band Vector Assigner Type

CVSS 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H NVD Primary published

CVSS 2.0 5.0 none AV:N/AC:L/Au:N/C:N/I:N/A:P NVD Primary

Version	Score	Band	Vector	Assigner	Type
CVSS 3.1	7.5	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`	NVD	Primary	published
CVSS 2.0	5.0	none	`AV:N/AC:L/Au:N/C:N/I:N/A:P`	NVD	Primary

Affected software and releases

Oracle advisories

Advisory	Type	Quarter	Products Oracle names in its risk matrix
Oracle Critical Patch Update April 2022 ↗	CPU	2022-Q2	Oracle Blockchain Platform / BCS Console (Netty) (Prior to 21.1.2)
Oracle Critical Patch Update July 2021 ↗	CPU	2021-Q3	Oracle Communications / KPI (Netty) (1.5.2) Oracle Communications Applications / HTTP GW (Netty) (12.0.0.3.0)
Oracle Critical Patch Update April 2021 ↗	CPU	2021-Q2	Oracle Communications Applications / Inventory Services (Netty) (7.4.2) Oracle Communications Applications / Message Store (Netty) (8.1.0) Oracle Fusion Middleware / Security Framework (Netty) (12.2.1.3.0, 12.2.1.4.0) Oracle NoSQL Database / Administration (Netty) (Prior to 20.3)
Oracle Critical Patch Update January 2021 ↗	CPU	2021-Q1	Oracle Financial Services Applications / Common (Netty) (14.0.0-14.4.0) Oracle Financial Services Applications / Common Core (Netty) (14.1.0, 14.3.0, 14.4.0) Oracle Financial Services Applications / Core (Netty) (14.1.0, 14.3.0, 14.4.0) Oracle Financial Services Applications / Core (Netty) (14.1.0, 14.3.0, 14.4.0) Oracle Financial Services Applications / Core (Netty) (14.2.0-14.4.0) Oracle Financial Services Applications / Dashboard (Netty) (14.1.0, 14.3.0, 14.4.0) Oracle Financial Services Applications / Infrastructure (Netty) (14.4.0) Oracle Financial Services Applications / Payments Core (Netty) (14.4.0)

Advisory

Type

Quarter

Products Oracle names in its risk matrix

Oracle Critical Patch Update April 2022 ↗

CPU

2022-Q2

Oracle Blockchain Platform / BCS Console (Netty) (Prior to 21.1.2)

Oracle Critical Patch Update July 2021 ↗

CPU

2021-Q3

Oracle Communications / KPI (Netty) (1.5.2)
Oracle Communications Applications / HTTP GW (Netty) (12.0.0.3.0)

Oracle Critical Patch Update April 2021 ↗

CPU

2021-Q2

Oracle Communications Applications / Inventory Services (Netty) (7.4.2)
Oracle Communications Applications / Message Store (Netty) (8.1.0)
Oracle Fusion Middleware / Security Framework (Netty) (12.2.1.3.0, 12.2.1.4.0)
Oracle NoSQL Database / Administration (Netty) (Prior to 20.3)

Oracle Critical Patch Update January 2021 ↗

CPU

2021-Q1

Oracle Financial Services Applications / Common (Netty) (14.0.0-14.4.0)
Oracle Financial Services Applications / Common Core (Netty) (14.1.0, 14.3.0, 14.4.0)
Oracle Financial Services Applications / Core (Netty) (14.1.0, 14.3.0, 14.4.0)
Oracle Financial Services Applications / Core (Netty) (14.1.0, 14.3.0, 14.4.0)
Oracle Financial Services Applications / Core (Netty) (14.2.0-14.4.0)
Oracle Financial Services Applications / Dashboard (Netty) (14.1.0, 14.3.0, 14.4.0)
Oracle Financial Services Applications / Infrastructure (Netty) (14.4.0)
Oracle Financial Services Applications / Payments Core (Netty) (14.4.0)

Oracle components and versions

Family	Component	Versions, as Oracle lists them	Read as
Oracle Blockchain Platform	BCS Console (Netty)	Prior to 21.1.2
Oracle Communications	KPI (Netty)	1.5.2	1.5.2
Oracle Communications Applications	HTTP GW (Netty)	12.0.0.3.0	12.0.0.3.0
Oracle Communications Applications	Inventory Services (Netty)	7.4.2	7.4.2
Oracle Communications Applications	Message Store (Netty)	8.1.0	8.1.0
Oracle Financial Services Applications	Common (Netty)	14.0.0-14.4.0
Oracle Financial Services Applications	Common Core (Netty)	14.1.0, 14.3.0, 14.4.0	14.1.0 · 14.3.0 · 14.4.0
Oracle Financial Services Applications	Core (Netty)	14.2.0-14.4.0	14.1.0 · 14.3.0 · 14.4.0
Oracle Financial Services Applications	Dashboard (Netty)	14.1.0, 14.3.0, 14.4.0	14.1.0 · 14.3.0 · 14.4.0
Oracle Financial Services Applications	Infrastructure (Netty)	14.4.0	14.4.0
Oracle Financial Services Applications	Payments Core (Netty)	14.4.0	14.4.0
Oracle Fusion Middleware	Security Framework (Netty)	12.2.1.3.0, 12.2.1.4.0	12.2.1.3.0 · 12.2.1.4.0
Oracle NoSQL Database	Administration (Netty)	Prior to 20.3

Family

Component

Versions, as Oracle lists them

Read as

Oracle Blockchain Platform

BCS Console (Netty)

Prior to 21.1.2

Oracle Communications

KPI (Netty)

1.5.2

Oracle Communications Applications

HTTP GW (Netty)

12.0.0.3.0

Oracle Communications Applications

Inventory Services (Netty)

7.4.2

Oracle Communications Applications

Message Store (Netty)

8.1.0

Oracle Financial Services Applications

Common (Netty)

14.0.0-14.4.0

Oracle Financial Services Applications

Common Core (Netty)

14.1.0, 14.3.0, 14.4.0

14.1.0 · 14.3.0 · 14.4.0

Oracle Financial Services Applications

Core (Netty)

14.2.0-14.4.0

14.1.0 · 14.3.0 · 14.4.0

Oracle Financial Services Applications

Dashboard (Netty)

14.1.0, 14.3.0, 14.4.0

14.1.0 · 14.3.0 · 14.4.0

Oracle Financial Services Applications

Infrastructure (Netty)

14.4.0

Oracle Financial Services Applications

Payments Core (Netty)

14.4.0

Oracle Fusion Middleware

Security Framework (Netty)

12.2.1.3.0, 12.2.1.4.0

12.2.1.3.0 · 12.2.1.4.0

Oracle NoSQL Database

Administration (Netty)

Prior to 20.3

Maven packages

Affected and fixed versions, from OSV.dev

Package Introduced Fixed Last affected

io.netty:netty-handler 4.1.0 4.1.46 unbounded

Package	Introduced	Fixed	Last affected
`io.netty:netty-handler`	4.1.0	`4.1.46`	unbounded

Products and versions

14 products, 16 version entries

Source	Vendor	Product	Scheme	Affected versions
nvd	debian	debian linux	generic	9.0 · 10.0
nvd	fedoraproject	fedora	generic	33
osv	io.netty	netty-handler	generic	≥ 4.1.0 and ＜ 4.1.46
nvd	netapp	oncommand api services	generic	any version
nvd	netapp	oncommand insight	generic	any version
nvd	netapp	oncommand workflow automation	generic	any version
nvd	netty	netty	generic	≥ 4.1 and ＜ 4.1.46
nvd	oracle	communications brm - elastic charging engine	generic	12.0.0.3
nvd	oracle	communications cloud native core service communication proxy	generic	1.5.2
nvd	oracle	communications design studio	generic	7.4.2
nvd	oracle	communications messaging server	generic	8.1
nvd	oracle	nosql database	generic	＜ 20.3
nvd	oracle	siebel core - server framework	generic	＜ 21.5
nvd	oracle	webcenter portal	generic	12.2.1.3.0 · 12.2.1.4.0

Source

Vendor

Product

Scheme

Affected versions

nvd

debian

debian linux

generic

9.0 · 10.0

nvd

fedoraproject

fedora

generic

osv

io.netty

netty-handler

generic

≥ 4.1.0 and ＜ 4.1.46

nvd

netapp

oncommand api services

generic

any version

nvd

netapp

oncommand insight

generic

any version

nvd

netapp

oncommand workflow automation

generic

any version

nvd

netty

generic

≥ 4.1 and ＜ 4.1.46

nvd

oracle

communications brm - elastic charging engine

generic

12.0.0.3

nvd

oracle

communications cloud native core service communication proxy

generic

1.5.2

nvd

oracle

communications design studio

generic

7.4.2

nvd

oracle

communications messaging server

generic

8.1

nvd

oracle

nosql database

generic

＜ 20.3

nvd

oracle

siebel core - server framework

generic

＜ 21.5

nvd

oracle

webcenter portal

generic

12.2.1.3.0 · 12.2.1.4.0

Earlier manual review

A reviewer classified this CVE in an older dataset. We kept the labels and products below, but not the reviewer's reasoning.

## Manual Classification Context **Labels:** HTTP, SECURITY FRAMEWORK (NETTY), COMMON (NETTY), INFRASTRUCTURE (NETTY), COMMON CORE (NETTY), INVENTORY SERVICES (NETTY), KPI (NETTY), HTTP GW (NETTY), NO AUTH REMOTE EXPLOIT, ADMINISTRATION (NETTY), DASHBOARD (NETTY), CORE (NETTY), MESSAGE STORE (NETTY), PAYMENTS CORE (NETTY) **Products:** ORACLE BANKING CREDIT FACILITIES PROCESS MANAGEMENT, ORACLE NOSQL DATABASE, ORACLE COMMUNICATIONS MESSAGING SERVER, ORACLE FLEXCUBE UNIVERSAL BANKING, ORACLE BANKING VIRTUAL ACCOUNT MANAGEMENT, ORACLE BANKING PAYMENTS, ORACLE COMMUNICATIONS BRM - ELASTIC CHARGING ENGINE, ORACLE COMMUNICATIONS CLOUD NATIVE CORE SERVICE COMMUNICATION PROXY, ORACLE FUSION MIDDLEWARE, ORACLE WEBCENTER PORTAL, ORACLE FINANCIAL SERVICES APPLICATIONS, ORACLE BANKING CORPORATE LENDING PROCESS MANAGEMENT, ORACLE COMMUNICATIONS, NETTY, ORACLE BANKING SUPPLY CHAIN FINANCE, ORACLE COMMUNICATIONS DESIGN STUDIO, ORACLE COMMUNICATIONS APPLICATIONS, ORACLE BANKING LIQUIDITY MANAGEMENT, ORACLE BANKING TRADE FINANCE PROCESS MANAGEMENT

References

URL	Tags
https://github.com/netty/netty/issues/6168	WEB
https://github.com/netty/netty/pull/9924	WEB
https://lists.apache.org/thread.html/r9c30b7fca4baedebcb46d6e0f90071b30cc4a0e074164d50122ec5ec@%3Ccommits.zookeeper.apache.org%3E	WEB
https://lists.apache.org/thread.html/ra98e3a8541a09271f96478d5e22c7e3bd1afdf48641c8be25d62d9f9@%3Ccommits.druid.apache.org%3E	WEB
https://lists.apache.org/thread.html/raaac04b7567c554786132144bea3dcb72568edd410c1e6f0101742e7@%3Cissues.flink.apache.org%3E	WEB
https://lists.apache.org/thread.html/rd302ddb501fa02c5119120e5fc21df9a1c00e221c490edbe2d7ad365@%3Cnotifications.zookeeper.apache.org%3E	WEB
https://lists.apache.org/thread.html/rdb69125652311d0c41f6066ff44072a3642cf33a4b5e3c4f9c1ec9c2@%3Ccommits.pulsar.apache.org%3E	WEB
https://lists.apache.org/thread.html/re1ea144e91f03175d661b2d3e97c7d74b912e019613fa90419cf63f4@%3Cissues.zookeeper.apache.org%3E	WEB
https://lists.apache.org/thread.html/ref2c8a0cbb3b8271e5b9a06457ba78ad2028128627186531730f50ef@%3Cnotifications.zookeeper.apache.org%3E	WEB
https://lists.apache.org/thread.html/ref3943adbc3a8813aee0e3a9dd919bacbb27f626be030a3c6d6c7f83@%3Ccommits.pulsar.apache.org%3E	WEB

URL

Timeline

Published	2020-04-07	By the CVE Program.
NVD record modified	2026-06-17	NVD's own last-modified date for this record.

Published

2020-04-07

By the CVE Program.

NVD record modified

2026-06-17

NVD's own last-modified date for this record.

How VRT decided (5 of 24 rules ran)

5 of 24 rules ran. The rest didn't run because an earlier rule had already settled the CVE.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? the first rule that matches decides

1 rejected no match CVE Program withdrawal of this identifier

scope: Is it a vulnerability Waratek protects? the first rule that matches decides

2 armr-patch-file no match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file no match An ARMR security-rule template on disk for this CVE

4 manual-classification no match A researcher's recorded decision for this specific CVE

5 manual classification decided it matched Outside Waratek scope Found in legacy manual classifications

6 non-java-upstream not reached A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component not reached The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the JInitiator browser plug-in, the native WebLogic proxy plug-in, or a native part of Oracle Application Server or Collaboration Suite (HTTP Server, Web Cache, Internet Directory, mail and calendar servers). Oracle gives these no CPE of their own and names them only in the description.

8 java-client-side not reached Oracle's own risk-matrix note saying the CVE is reached only through untrusted code in the Java sandbox (applets, Web Start) or only through a client installation of Java, so a server running its own trusted code is not exposed

9 osv-maven not reached An OSV.dev record of this CVE affecting a package published to Maven Central. When every such package is one business applications do not use (Minecraft mods and launchers, Fastjson) and no tracked product is named by CPE, it settles the CVE as Outside Waratek scope instead

10 cna-maven-package not reached An affected Maven artifact named by the CNA itself

11 known-cpe-product not reached An NVD CPE naming a product ARMR tracks

12 cna-cpe-product not reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

13 oracle-advisory-family not reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

14 cna-named-product not reached A tracked product named in words by the CVE's own CNA, on a record with no CPE yet. Apache and Eclipse publish these on advisory day, before NVD adds CPE data.

15 non-deployable-product not reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

16 unmatched-product not reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? every rule runs

17 patch-hint not reached A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

18 open-source-maven not reached The affected package being open source on Maven, so the fix can be read

19 poc-derivable not reached An indexed exploit clearing the evidence bar to reverse-engineer, where there is no source to read

20 no-exploit not reached Nothing to build a rule from yet: no published exploit, no CISA record of exploitation and no source-level change to read

21 secure-rule-match not reached A vulnerability class already blocked by an ARMR security rule

22 exploited-no-fix-or-poc not reached Somebody exploiting this CVE (a CISA or VulnCheck KEV listing, or a CISA verdict of active exploitation), with no fix, source code or PoC to build a rule from

23 below-action-threshold not reached Medium or Low severity, no CISA or VulnCheck KEV listing, no PoC clearing the evidence bar, no CISA verdict, no Oracle advisory

24 no-exploit-published not reached Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all

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