CVE-2022-41881Network attack vector

Service crash via nested HAProxy SSL TLVs

Published Dec 12, 2022 · Updated Apr 22, 2025

Uncontrolled recursion in Netty before 4.1.86.Final allows remote attackers to crash direct HAProxyMessageDecoder consumers with nested SSL TLVs. HAProxyMessage.readNextTLV recursively decodes each encapsulated PP2_TYPE_SSL value without enforcing a nesting-depth limit. A crafted HAProxy protocol v2 message must reach the codec; ChannelPipeline use catches the error, while direct decoder use can terminate the consuming service.

CVSS severity7.5
High
EPSS probability1.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled recursion in Netty before 4.1.86.Final allows remote attackers to crash direct HAProxyMessageDecoder consumers with nested SSL TLVs. HAProxyMessage.readNextTLV recursively decodes each encapsulated PP2_TYPE_SSL value without enforcing a nesting-depth limit. A crafted HAProxy protocol v2 message must reach the codec; ChannelPipeline use catches the error, while direct decoder use can terminate the consuming service.

The record

CVE
CVE-2022-41881
Published
Dec 12, 2022
Updated
Apr 22, 2025
Vendor
The Netty Project
Product
Netty
Classifications
CWE-674, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 12, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.1.86.Final

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Netty Project · Nettyversion=< 4.1.86.Final

Published CVSS scores

7.5NVD via OSVCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-674Uncontrolled Recursion
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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