CVE-2022-42471Network attack vector

Header injection via unneutralized CRLF sequences

Published Jan 3, 2023 · Updated Oct 22, 2024

HTTP response splitting in the FortiWeb API allows remote authenticated users to inject arbitrary HTTP response headers. Fortinet identifies improper CRLF neutralization in the API but has not published the affected endpoint, field, or underlying implementation error. The attack requires valid API access and user interaction; the published impact is limited to header injection, with no reported code execution or service interruption.

CVSS severity5.4
Medium
EPSS probability0.46%
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 the FortiWeb API allows remote authenticated users to inject arbitrary HTTP response headers. Fortinet identifies improper CRLF neutralization in the API but has not published the affected endpoint, field, or underlying implementation error. The attack requires valid API access and user interaction; the published impact is limited to header injection, with no reported code execution or service interruption.

The record

CVE
CVE-2022-42471
Published
Jan 3, 2023
Updated
Oct 22, 2024
Vendor
Fortinet
Product
FortiWeb
Classifications
CWE-113, CWE-74
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 2024Record 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=6.3.6 <=6.3.21
  2. Affected versionversion=6.4.0 <=6.4.2
  3. Affected versionversion=7.0.0 <=7.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Fortinet · FortiWebversion=6.3.6 <=6.3.21; version=6.4.0 <=6.4.2; version=7.0.0 <=7.0.2

Published CVSS scores

5.4Fortinet, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Public exploit references

No public exploit references are available in this record.

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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