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CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')
Weakness Summary
The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.
- Canonical source: MITRE CWE-93 (opens in a new tab)
- Published Atomicorp CVE observations: 7
- Distinct affected products in those observations: 7
- Active Atomicorp rules associated with this weakness: 26
Atomicorp Research Context
Atomicorp has published CVE-specific research observations associated with this weakness category. Each linked CVE page states whether the tested request was detected or blocked and is the authoritative customer-facing finding.
The CVEs and rules shown here are selected published examples, not a complete list of Atomicorp protections. If a CWE, CVE, or rule is absent from this page, no conclusion should be drawn about whether Atomicorp protects against that weakness or attack method.
A CWE describes a class of software weakness. It does not identify one exploit request, and association with a CWE does not mean that every vulnerability or exploitation path in that category is detected or blocked.
Selected Published CVE Observations
| CVE | Vulnerability | Product | Atomicorp finding | Observed rules |
|---|---|---|---|---|
| CVE-2026-39394 | CI4MS has an .env CRLF Injection via Unvalidated host Parameter in Install Controller | ci4ms | Attack Blocked by Atomicorp | 340007 , 344360 , 347009 |
| CVE-2026-84372 | Predis: Redis command injection and denial of service via CRLF smuggling in pipelined commands on aggregate connections | predis | Attack Blocked by Atomicorp | 340014 , 340023 , 340029 , 340193 , 344360 , 344361 , 344363 , 344364 , 344366 , 344370 , 347009 , 390722 , 393655 |
| CVE-2022-0666 | Microweber < 1.2.11 - CRLF Injection | microweber | Attack Blocked by Atomicorp | 330708 , 390722 |
| CVE-2025-61884 | Oracle E-Business Suite - Server-Side Request Forgery | configurator | Attack Blocked by Atomicorp | 337109 , 337110 , 340162 , 340163 , 340165 , 341256 , 342259 , 344360 , 347009 , 390722 , 398021 , 398022 |
| CVE-2016-4975 | Apache mod_userdir CRLF injection | http server | Attack Blocked by Atomicorp | 330708 , 390714 |
| CVE-2017-5868 | OpenVPN Access Server 2.1.4 - CRLF Injection | openvpn access server | Attack Blocked by Atomicorp | 330708 , 390714 |
| CVE-2026-42578 | Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation | netty | Attack Blocked by Atomicorp | 390719 |
Associated Atomicorp WAF Rules
| Rule | Status | Behavior |
|---|---|---|
| 330708 | Active | disruptive (deny) |
| 337109 | Active | disruptive (deny) |
| 337110 | Active | disruptive (deny) |
| 340007 | Active | disruptive (deny) |
| 340014 | Active | disruptive (deny) |
| 340023 | Active | disruptive (deny) |
| 340029 | Active | disruptive (deny) |
| 340162 | Active | disruptive (deny) |
| 340163 | Active | disruptive (deny) |
| 340165 | Active | disruptive (deny) |
| 340193 | Active | disruptive (deny) |
| 341256 | Active | disruptive (deny) |
| 342259 | Active | disruptive (deny) |
| 344360 | Active | disruptive (deny) |
| 344361 | Active | disruptive (deny) |
| 344363 | Active | disruptive (deny) |
| 344364 | Active | disruptive (deny) |
| 344366 | Active | disruptive (deny) |
| 344370 | Active | disruptive (deny) |
| 347009 | Active | disruptive (deny) |
| 390714 | Active | disruptive (deny) |
| 390719 | Active | disruptive (deny) |
| 390722 | Active | disruptive (deny) |
| 393655 | Active | disruptive (deny) |
| 398021 | Active | disruptive (deny) |
| 398022 | Active | disruptive (deny) |
Related MITRE CAPEC Context
MITRE associates this CWE with the following attack-pattern entries. These taxonomy relationships are context, not Atomicorp coverage claims:
CAPEC-15 (opens in a new tab) , CAPEC-81 (opens in a new tab)