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CVE-2021-37136· NVD / CVE Program· CNA JFROG

The Bzip2 decompression decoder function doesn't allow setting size restrictions on the decompressed output data (which affects the allocati

The Bzip2 decompression decoder function doesn't allow setting size restrictions on the decompressed output data (which affects the allocation size used during decompression). All users of Bzip2Decoder are affected. The malicious input can trigger an OOME and so a DoS attack

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Oct 19, 2021
Updated
Jun 17, 2026
EPSS
5.9% · 93th percentile
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Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 5.9%

Noroxi analysis

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Affected systems

VendorProduct
nettynetty
quarkusquarkus
oraclebanking apis
oraclebanking digital experience
oraclecoherence
oraclecommerce guided search
oraclecommunications brm - elastic charging engine
oraclecommunications cloud native core binding support function
oraclecommunications cloud native core network slice selection function
oraclecommunications cloud native core policy
oraclecommunications cloud native core security edge protection proxy
oraclecommunications cloud native core unified data repository

and 7 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • debian debian linux11.0
  • netapp oncommand insightall versions
  • netty nettybefore 4.1.68
  • oracle banking apis18.1 and later · up to 18.3 inclusive
  • oracle banking apis19.1
  • oracle banking apis19.2
  • oracle banking apis20.1
  • oracle banking apis21.1
  • oracle banking digital experience18.1
  • oracle banking digital experience18.2
  • oracle banking digital experience18.3
  • oracle banking digital experience19.1
  • oracle banking digital experience19.2
  • oracle banking digital experience20.1
  • oracle banking digital experience21.1
  • oracle coherence12.2.1.4.0
  • oracle coherence14.1.1.0.0
  • oracle commerce guided search11.3.2
  • oracle communications brm - elastic charging enginebefore 12.0.0.4.6

Versions reported by the vendor

Affected version ranges reported by the assigning authority (JFROG). Independent of NVD's CPE analysis and usually ahead of it.

  • The Netty project Netty

    • unspecified and later · before 4.1.68Finalaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:10nettybefore 1:4.1.33-1+deb10u31:4.1.33-1+deb10u3
Debian:11nettybefore 1:4.1.48-4+deb11u11:4.1.48-4+deb11u1
Debian:12nettybefore 1:4.1.48-61:4.1.48-6
Mavenio.netty:nettyall versions—
Mavenio.netty:netty-codecbefore 4.1.68.Final4.1.68.Final
Mavenorg.jboss.netty:nettyall versions—
openSUSE:Leap 15.3nettybefore 4.1.75-150200.4.6.24.1.75-150200.4.6.2
openSUSE:Tumbleweednettybefore 4.1.114-1.14.1.114-1.1
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-glassfish-elbefore 0:3.0.1-4.b08_redhat_00005.1.ep7.el70:3.0.1-4.b08_redhat_00005.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-glassfish-el-implbefore 0:3.0.1-4.b08_redhat_00005.1.ep7.el70:3.0.1-4.b08_redhat_00005.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-hibernatebefore 0:5.1.17-3.Final_redhat_00004.1.ep7.el70:5.1.17-3.Final_redhat_00004.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-hibernate-corebefore 0:5.1.17-3.Final_redhat_00004.1.ep7.el70:5.1.17-3.Final_redhat_00004.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-hibernate-entitymanagerbefore 0:5.1.17-3.Final_redhat_00004.1.ep7.el70:5.1.17-3.Final_redhat_00004.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-hibernate-enversbefore 0:5.1.17-3.Final_redhat_00004.1.ep7.el70:5.1.17-3.Final_redhat_00004.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-hibernate-infinispanbefore 0:5.1.17-3.Final_redhat_00004.1.ep7.el70:5.1.17-3.Final_redhat_00004.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-hibernate-java8before 0:5.1.17-3.Final_redhat_00004.1.ep7.el70:5.1.17-3.Final_redhat_00004.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-jackson-databindbefore 0:2.8.11.6-3.SP1_redhat_00003.1.ep7.el70:2.8.11.6-3.SP1_redhat_00003.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-jboss-ejb-clientbefore 0:4.0.12-1.Final_redhat_00002.1.ep7.el70:4.0.12-1.Final_redhat_00002.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-nettybefore 0:4.1.63-2.Final_redhat_00003.1.ep7.el70:4.1.63-2.Final_redhat_00003.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-netty-allbefore 0:4.1.63-2.Final_redhat_00003.1.ep7.el70:4.1.63-2.Final_redhat_00003.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-undertowbefore 0:1.4.18-16.SP14_redhat_00001.1.ep7.el70:1.4.18-16.SP14_redhat_00001.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-wildflybefore 0:7.1.11-4.GA_redhat_00002.1.ep7.el70:7.1.11-4.GA_redhat_00002.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-wildfly-elytronbefore 0:1.1.14-1.Final_redhat_00001.1.ep7.el70:1.1.14-1.Final_redhat_00001.1.ep7.el7
Red Hat:jboss_enterprise_application_platform_eus:7.1::el7eap7-wildfly-http-clientbefore 0:1.0.21-1.Final_redhat_00001.1.ep7.el70:1.0.21-1.Final_redhat_00001.1.ep7.el7

+96

Other highest-scoring records for the same primary product.

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    40Plan
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    40Plan
  • CVE-2019-20445HttpObjectDecoder.java in Netty before 4.1.44 allows a Content-Length header to be accompanied by a second Content-Length header, or by a Tr
    40Plan
  • CVE-2026-42581Netty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization
    39Monitor
  • CVE-2019-20444HttpObjectDecoder.java in Netty before 4.1.44 allows an HTTP header that lacks a colon, which might be interpreted as a separate header with
    39Monitor
  • CVE-2026-75595Netty: SNI Routing Bypass via Fragmented TLS ClientHello Causing Fallback to Default SslContext
    36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:netty1:4.1.48-6 · Debian:12Package registry (OSV)
Maven:io.netty:netty-codec4.1.68.FinalPackage registry (OSV)
opensuse:netty4.1.75-150200.4.6.2 · openSUSE:Leap 15.3Package registry (OSV)
red hat:eap7-jackson-databind0:2.12.6.1-1.redhat_00003.1.el7eap · Red Hat:jboss_enterprise_application_platform:7.4::el7Package registry (OSV)
red hat:eap7-netty0:4.1.72-4.Final_redhat_00001.1.el7eap · Red Hat:jboss_enterprise_application_platform:7.4::el7Package registry (OSV)
red hat:eap7-netty-all0:4.1.72-4.Final_redhat_00001.1.el7eap · Red Hat:jboss_enterprise_application_platform:7.4::el7Package registry (OSV)
red hat:eap7-netty-buffer0:4.1.72-4.Final_redhat_00001.1.el7eap · Red Hat:jboss_enterprise_application_platform:7.4::el7Package registry (OSV)
red hat:eap7-netty-codec0:4.1.72-4.Final_redhat_00001.1.el7eap · Red Hat:jboss_enterprise_application_platform:7.4::el7Package registry (OSV)
red hat:eap7-netty-codec-dns0:4.1.72-4.Final_redhat_00001.1.el7eap · Red Hat:jboss_enterprise_application_platform:7.4::el7Package registry (OSV)
red hat:eap7-netty-codec-haproxy0:4.1.72-4.Final_redhat_00001.1.el7eap · Red Hat:jboss_enterprise_application_platform:7.4::el7Package registry (OSV)
red hat:eap7-netty-codec-http0:4.1.72-4.Final_redhat_00001.1.el7eap · Red Hat:jboss_enterprise_application_platform:7.4::el7Package registry (OSV)
red hat:eap7-netty-codec-http20:4.1.72-4.Final_redhat_00001.1.el7eap · Red Hat:jboss_enterprise_application_platform:7.4::el7Package registry (OSV)
red hat:eap7-netty-codec-memcache0:4.1.72-4.Final_redhat_00001.1.el7eap · Red Hat:jboss_enterprise_application_platform:7.4::el7Package registry (OSV)
red hat:eap7-netty-codec-mqtt0:4.1.72-4.Final_redhat_00001.1.el7eap · Red Hat:jboss_enterprise_application_platform:7.4::el7Package registry (OSV)
red hat:eap7-netty-codec-redis0:4.1.72-4.Final_redhat_00001.1.el7eap · Red Hat:jboss_enterprise_application_platform:7.4::el7Package registry (OSV)
rocky linux:libdb0:5.3.28-42.el8_4 · Rocky Linux:8Package registry (OSV)
suse:netty4.1.44.Final-150300.4.3.2 · SUSE:Manager Server Module 4.2Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

CVSS vector

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

nvd-primary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
function expand(node) {  return node.children.map(expand);}

Fixed

ts
const MAX_DEPTH = 32;function expand(node, depth = 0) {  if (depth > MAX_DEPTH) throw new Error("too deep");  return node.children.map((c) => expand(c, depth + 1));}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

All records