Skip to content

Denial of Service in Netty

High severity GitHub Reviewed Published Jun 15, 2020 to the GitHub Advisory Database • Updated Feb 1, 2023

Package

maven io.netty:netty-handler (Maven)

Affected versions

>= 4.1.0, < 4.1.46

Patched versions

4.1.46

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.

References

Published by the National Vulnerability Database Apr 7, 2020
Reviewed Jun 11, 2020
Published to the GitHub Advisory Database Jun 15, 2020
Last updated Feb 1, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.791%
(82nd percentile)

Weaknesses

CVE ID

CVE-2020-11612

GHSA ID

GHSA-mm9x-g8pc-w292

Source code

No known source code
Loading Checking history
See something to contribute? Suggest improvements for this vulnerability.