{ "dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": { "cveId": "CVE-2025-40927", "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "state": "PUBLISHED", "assignerShortName": "CPANSec", "dateReserved": "2025-04-16T09:05:34.362Z", "datePublished": "2025-08-29T00:10:07.161Z", "dateUpdated": "2025-08-29T13:18:32.704Z" }, "containers": { "cna": { "affected": [ { "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" } ] } ], "credits": [ { "lang": "en", "type": "finder", "value": "Maxim Kosenko" } ], "descriptions": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "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.

The issue documented in CVE-2010-4410 is related but the fix was incomplete. 

Impact

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

  1. Break the current HTTP header
  2. Inject a new header or entire body
  3. Deliver a script payload that is reflected in the server’s response

That can lead to the following attacks:


" } ], "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" } ], "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 Request/Response Splitting')", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "shortName": "CPANSec", "dateUpdated": "2025-08-29T00:10:07.161Z" }, "references": [ { "tags": [ "related" ], "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": [ "technical-description" ], "url": "https://owasp.org/www-community/attacks/HTTP_Response_Splitting" }, { "tags": [ "technical-description" ], "url": "https://datatracker.ietf.org/doc/html/rfc7230#section-3" }, { "tags": [ "related" ], "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" } ], "solutions": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "Upgrade CGI::Simple to version 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" } } ] } }