CVE-2022-41915Public exploitNetwork attack vector

Response-header injection via unvalidated value iterators

Published Dec 13, 2022 · Updated Apr 22, 2025

HTTP response splitting in Netty 4.1.83.Final through 4.1.85.Final allows remote attackers to inject response headers via crafted values. DefaultHeaders.setObject converts iterator or array elements and inserts them without invoking the configured value validator, allowing CRLF sequences to enter an HTTP header. Reachability requires an integrating application to pass attacker-controlled values through an affected overload; successful injection can alter downstream HTTP responses.

CVSS severity6.5
Medium
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP response splitting in Netty 4.1.83.Final through 4.1.85.Final allows remote attackers to inject response headers via crafted values. DefaultHeaders.setObject converts iterator or array elements and inserts them without invoking the configured value validator, allowing CRLF sequences to enter an HTTP header. Reachability requires an integrating application to pass attacker-controlled values through an affected overload; successful injection can alter downstream HTTP responses.

The record

CVE
CVE-2022-41915
Published
Dec 13, 2022
Updated
Apr 22, 2025
Vendor
The Netty Project
Product
Netty
Classifications
CWE-113, CWE-436
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 13, 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=4.1.83.Final <4.1.83.Final*
  2. Affected versionversion=4.1.86.Final <4.1.86.Final

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Netty Project · Nettyversion=4.1.83.Final <4.1.83.Final*; version=4.1.86.Final <4.1.86.Final

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
CWE-436Interpretation Conflict

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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