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CVE-2025-40927

Estado: AplazadaAlta (7.3)—

CGI::Simple versions before 1.282 for Perl has a HTTP response splitting flaw This vulnerability is a confirmed HTTP response splitting flaw in CGI::Simple that allows HTTP response header injection, which can be used for reflected XSS or open redirect under certain conditions.

Although some validation exists, it can be bypassed using URL-encoded values, allowing an attacker to inject untrusted content into the response via query parameters.

As a result, an attacker can inject a line break (e.g. %0A) into the parameter value, causing the server to split the HTTP response and inject arbitrary headers or even an HTML/JavaScript body, leading to reflected cross-site scripting (XSS), open redirect or other attacks.

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The issue documented in CVE-2010-4410 https://www.cve.org/CVERecord?id=CVE-2010-4410 is related but the fix was incomplete.

Impact

By injecting %0A (newline) into a query string parameter, an attacker can:

Detalles técnicos trazas, registros y código del informe original
  *  Break the current HTTP header
  *  Inject a new header or entire body
  *  Deliver a script payload that is reflected in the server’s response
That can lead to the following attacks:

  *  reflected XSS
  *  open redirect
  *  cache poisoning
  *  header manipulation

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Inferido por reglas deterministas a partir del vector CVSS y la CWE. Solo orientativo.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network TrafficApplication Isolation and Sandboxing

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

CGI — CGI SimpleAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-40927",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-40927",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
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          "version": "2.0.3",
          "timestamp": "2025-08-29T13:18:01.758812Z"
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
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          "confidentialityImpact": "LOW"
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          "repo": "https://github.com/manwar/CGI--Simple",
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          "versions": [
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              "status": "affected",
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  "published": "2025-08-29T01:15:34.553",
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      "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-2320",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
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      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
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      "url": "https://rt.perl.org/Public/Bug/Display.html?id=21951",
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  "descriptions": [
    {
      "lang": "en",
      "value": "CGI::Simple versions before 1.282 for Perl has a HTTP response splitting flaw\nThis vulnerability is a confirmed HTTP response splitting flaw in CGI::Simple that allows HTTP response header injection, which can be used for reflected XSS or open redirect under certain conditions.\n\nAlthough some validation exists, it can be bypassed using URL-encoded values, allowing an attacker to inject untrusted content into the response via query parameters.\n\n\n\nAs a result, an attacker can inject a line break (e.g. %0A) into the parameter value, causing the server to split the HTTP response and inject arbitrary headers or even an HTML/JavaScript body, leading to reflected cross-site scripting (XSS), open redirect or other attacks.\n\nThe issue documented in CVE-2010-4410 https://www.cve.org/CVERecord?id=CVE-2010-4410 is related but the fix was incomplete.\n\nImpact\n\nBy injecting %0A (newline) into a query string parameter, an attacker can:\n\n  *  Break the current HTTP header\n  *  Inject a new header or entire body\n  *  Deliver a script payload that is reflected in the server’s response\nThat can lead to the following attacks:\n\n  *  reflected XSS\n  *  open redirect\n  *  cache poisoning\n  *  header manipulation"
    }
  ],
  "lastModified": "2026-06-17T09:22:18.517",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
}