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CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Weakness Summary
The product receives data from an HTTP agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes CR and LF characters before the data is included in outgoing HTTP headers.
- Canonical source: MITRE CWE-113 (opens in a new tab)
- Published Atomicorp CVE observations: 5
- Distinct affected products in those observations: 5
- Active Atomicorp rules associated with this weakness: 20
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-2026-55486 | Goobi viewer: IIIF Auth 2.0 origin parameter unsanitized — CSP malformation and reflected XSS | goobi-viewer-core | Protected by Atomicorp rules | 333140 , 333141 , 340087 , 340095 , 340099 , 340147 , 340148 , 341099 , 341256 , 341266 , 342259 , 346755 , 350147 , 350148 |
| CVE-2024-52875 | Kerio Control v9.2.5 - CRLF Injection | kerio control | Protected by Atomicorp rules | 390716 |
| CVE-2018-16979 | Monstra CMS 3.0.4 - HTTP Header Injection | monstra | Protected by Atomicorp rules | 330708 , 390722 |
| CVE-2026-42578 | Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation | netty | Protected by Atomicorp rules | 390719 |
| CVE-2026-94216 | ST Engineering iDirect Evolution/Velocity WebServer Evolution HTTP Header webserver authorize redirect | iDX | Protected by Atomicorp rules | 340165 , 344365 |
Associated Atomicorp WAF Rules
| Rule | Status | Behavior |
|---|---|---|
| 330708 | Active | disruptive (deny) |
| 333140 | Active | disruptive (deny) |
| 333141 | Active | disruptive (deny) |
| 340087 | Active | disruptive (deny) |
| 340095 | Active | disruptive (deny) |
| 340099 | Active | disruptive (deny) |
| 340147 | Active | disruptive (deny) |
| 340148 | Active | disruptive (deny) |
| 340165 | Active | disruptive (deny) |
| 341099 | Active | disruptive (deny) |
| 341256 | Active | disruptive (deny) |
| 341266 | Active | disruptive (deny) |
| 342259 | Active | disruptive (deny) |
| 344365 | Active | disruptive (deny) |
| 346755 | Active | disruptive (deny) |
| 350147 | Active | disruptive (deny) |
| 350148 | Active | disruptive (deny) |
| 390716 | Active | disruptive (deny) |
| 390719 | Active | disruptive (deny) |
| 390722 | 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-105 (opens in a new tab) , CAPEC-31 (opens in a new tab) , CAPEC-34 (opens in a new tab) , CAPEC-85 (opens in a new tab)