CVE-2025-40927

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<strong>confirmed HTTP response splitting</strong>&nbsp;flaw in <code>CGI::Simple</code>&nbsp;<span style=\"background-color: rgb(255, 255, 255);\">that allows HTTP response header injection, which can be used for reflected XSS or open redirect under certain conditions</span>.</p><p>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.</p><p></p><p>As a result, an attacker can inject a line break (e.g. <code>%0A</code>) 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.</p><p>The issue documented in&nbsp;<a target=\"_blank\" rel=\"nofollow\" href=\"https://www.cve.org/CVERecord?id=CVE-2010-4410\">CVE-2010-4410</a><span style=\"background-color: rgb(255, 255, 255);\">&nbsp;is related but the fix was incomplete.</span>&nbsp;</p><p><strong>Impact</strong></p><p>By injecting <code>%0A</code>&nbsp;(newline) into a query string parameter, an attacker can:</p><ol><li>Break the current HTTP header</li><li>Inject a new header or entire body</li><li>Deliver a script payload that is reflected in the server\u2019s response</li></ol><p>That can lead to the following attacks:</p><ul><li>reflected XSS</li><li>open redirect</li><li>cache poisoning</li><li>header manipulation</li></ul><br>"}], "value": "CGI::Simple versions before 1.282 for Perl has a HTTP response splitting flaw\nThis vulnerability is a confirmed HTTP response splitting\u00a0flaw in CGI::Simple\u00a0that 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\u00a0(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\u2019s response\nThat can lead to the following attacks:\n\n * reflected XSS\n * open redirect\n * cache poisoning\n * header manipulation"}], "impacts": [{"capecId": "CAPEC-34", "descriptions": [{"lang": "en", "value": "CAPEC-34 HTTP Response Splitting"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-113", "description": "CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP 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1.282 or higher"}], "value": "Upgrade CGI::Simple to version 1.282 or higher"}], "source": {"discovery": "EXTERNAL"}, "title": "CGI::Simple versions 1.281 and earlier for Perl has a HTTP response splitting flaw", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.3, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2025-08-29T13:18:01.758812Z", "id": "CVE-2025-40927", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-08-29T13:18:32.704Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.3, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2025-40927", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2025-08-29T13:18:01.758812Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-08-29T13:18:24.306Z"}}], "cna": {"title": "CGI::Simple versions 1.281 and earlier for Perl has a HTTP response splitting flaw", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "Maxim Kosenko"}], "impacts": [{"capecId": "CAPEC-34", "descriptions": [{"lang": "en", "value": "CAPEC-34 HTTP Response Splitting"}]}], "affected": [{"repo": "https://github.com/manwar/CGI--Simple", "vendor": "MANWAR", "product": "CGI::Simple", "versions": [{"status": "affected", "version": "0", "lessThan": "1.282", "versionType": "custom"}], "packageName": "CGI-Simple", "programFiles": ["lib/CGI/Simple.pm"], "collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected"}], "solutions": [{"lang": "en", "value": "Upgrade CGI::Simple to version 1.282 or higher", "supportingMedia": [{"type": "text/html", "value": "Upgrade CGI::Simple to version 1.282 or higher", "base64": false}]}], "references": [{"url": "https://metacpan.org/release/MANWAR/CGI-Simple-1.281/source/lib/CGI/Simple.pm#L1031-1035", "tags": ["related"]}, {"url": "https://metacpan.org/release/MANWAR/CGI-Simple-1.281/diff/MANWAR/CGI-Simple-1.282/lib/CGI/Simple.pm", "tags": ["related"]}, {"url": "https://owasp.org/www-community/attacks/HTTP_Response_Splitting", "tags": ["technical-description"]}, {"url": "https://datatracker.ietf.org/doc/html/rfc7230#section-3", "tags": ["technical-description"]}, {"url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-2320", "tags": ["related"]}, {"url": "https://rt.perl.org/Public/Bug/Display.html?id=21951", "tags": ["related"]}], "x_generator": {"engine": "Vulnogram 0.2.0"}, "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\u00a0flaw in CGI::Simple\u00a0that 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\u00a0(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\u2019s response\nThat can lead to the following attacks:\n\n * reflected XSS\n * open redirect\n * cache poisoning\n * header manipulation", "supportingMedia": [{"type": "text/html", "value": "CGI::Simple versions before 1.282 for Perl has a HTTP response splitting flaw<br><p>This 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{"affected": [{"affectedData": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "packageName": "CGI-Simple", "product": "CGI::Simple", "programFiles": ["lib/CGI/Simple.pm"], "repo": "https://github.com/manwar/CGI--Simple", "vendor": "MANWAR", "versions": [{"lessThan": "1.282", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}], "cveTags": [], "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\u00a0flaw in CGI::Simple\u00a0that 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\u00a0(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\u2019s response\nThat can lead to the following attacks:\n\n * reflected XSS\n * open redirect\n * cache poisoning\n * header manipulation"}, {"lang": "es", "value": "Las versiones de CGI::Simple anteriores a la 1.282 para Perl tienen una falla de divisi\u00f3n de respuesta HTTP.\nEsta vulnerabilidad es una falla confirmada de divisi\u00f3n de respuesta HTTP en CGI::Simple que permite la inyecci\u00f3n de encabezados de respuesta HTTP, la cual puede usarse para XSS reflejado o redirecci\u00f3n abierta bajo ciertas condiciones.\n\nAunque existe cierta validaci\u00f3n, puede ser evadida usando valores codificados en URL, permitiendo a un atacante inyectar contenido no confiable en la respuesta a trav\u00e9s de par\u00e1metros de consulta.\n\nComo resultado, un atacante puede inyectar un salto de l\u00ednea (por ejemplo, %0A) en el valor del par\u00e1metro, haciendo que el servidor divida la respuesta HTTP e inyecte encabezados arbitrarios o incluso un cuerpo HTML/JavaScript, lo que lleva a cross-site scripting (XSS) reflejado, redirecci\u00f3n abierta u otros ataques.\n\nEl problema documentado en CVE-2010-4410 https://www.cve.org/CVERecord?id=CVE-2010-4410 est\u00e1 relacionado pero la soluci\u00f3n fue incompleta.\n\nImpacto\n\nAl inyectar %0A (salto de l\u00ednea) en un par\u00e1metro de cadena de consulta, un atacante puede:\n\n* Romper el encabezado HTTP actual\n* Inyectar un nuevo encabezado o un cuerpo completo\n* Entregar una carga \u00fatil de script que se refleja en la respuesta del servidor\n\nEso puede llevar a los siguientes ataques:\n\n* XSS reflejado\n* redirecci\u00f3n abierta\n* envenenamiento de cach\u00e9\n* manipulaci\u00f3n de encabezados"}], "id": "CVE-2025-40927", "lastModified": "2026-10-18T21:10:00.120", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-40927", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-08-29T13:18:01.758812Z", "version": "2.0.3"}}]}, "published": "2025-08-29T01:15:34.553", "references": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-2320"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://datatracker.ietf.org/doc/html/rfc7230#section-3"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://metacpan.org/release/MANWAR/CGI-Simple-1.281/diff/MANWAR/CGI-Simple-1.282/lib/CGI/Simple.pm"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://metacpan.org/release/MANWAR/CGI-Simple-1.281/source/lib/CGI/Simple.pm#L1031-1035"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://owasp.org/www-community/attacks/HTTP_Response_Splitting"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://rt.perl.org/Public/Bug/Display.html?id=21951"}], "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-113"}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary"}]}

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