CVE-2022-3918Public exploitNetwork attack vector

HTTP request injection via unchecked header values

Published Jan 20, 2023 · Updated Apr 2, 2025

CRLF injection in Swift Foundation before 5.7.3 allows attackers to inject HTTP headers or requests through URLRequest values. URLRequest header setters accepted CR and LF characters, and URLSession serialized those values into outbound HTTP messages without rejecting invalid line breaks. Exploitation requires a consuming application to place attacker-controlled, unsanitized data in a header value; successful injection can add headers or a second request to an intermediary or backend server.

CVSS severity8.8
High
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CRLF injection in Swift Foundation before 5.7.3 allows attackers to inject HTTP headers or requests through URLRequest values. URLRequest header setters accepted CR and LF characters, and URLSession serialized those values into outbound HTTP messages without rejecting invalid line breaks. Exploitation requires a consuming application to place attacker-controlled, unsanitized data in a header value; successful injection can add headers or a second request to an intermediary or backend server.

The record

CVE
CVE-2022-3918
Published
Jan 20, 2023
Updated
Apr 2, 2025
Vendor
Swift Project
Product
Swift Foundation
Classifications
CWE-113, CAPEC-105
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 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=unspecified <=5.7.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Swift Project · Swift Foundationversion=unspecified <=5.7.2

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

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

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
CAPEC-105HTTP Request Splitting

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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