CVE-2025-40927
CGI::Simple versions 1.281 and earlier for Perl has a HTTP response splitting flaw
Description
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 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: * 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
INFO
Published Date :
Aug. 29, 2025, 1:15 a.m.
Last Modified :
Oct. 18, 2026, 9:10 p.m.
Remotely Exploit :
Yes !
Source :
9b29abf9-4ab0-4765-b253-1875cd9b441e
Affected Products
The following products are affected by CVE-2025-40927
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update CGI::Simple to version 1.282 or later.
- Sanitize user input for line breaks.
- Validate all HTTP headers.
- Implement strict output encoding.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-40927.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-40927 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-40927
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-40927 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-40927 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Oct. 18, 2026
Action Type Old Value New Value Added Translation Title: CGI::Simple de MANWAR, Description: Las versiones de CGI::Simple anteriores a la 1.282 para Perl tienen una falla de división de respuesta HTTP. Esta vulnerabilidad es una falla confirmada de división de respuesta HTTP en CGI::Simple que permite la inyección de encabezados de respuesta HTTP, la cual puede usarse para XSS reflejado o redirección abierta bajo ciertas condiciones. Aunque existe cierta validación, puede ser evadida usando valores codificados en URL, permitiendo a un atacante inyectar contenido no confiable en la respuesta a través de parámetros de consulta. Como resultado, un atacante puede inyectar un salto de línea (por ejemplo, %0A) en el valor del parámetro, 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, redirección abierta u otros ataques. El problema documentado en CVE-2010-4410 https://www.cve.org/CVERecord?id=CVE-2010-4410 está relacionado pero la solución fue incompleta. Impacto Al inyectar %0A (salto de línea) en un parámetro de cadena de consulta, un atacante puede: * Romper el encabezado HTTP actual * Inyectar un nuevo encabezado o un cuerpo completo * Entregar una carga útil de script que se refleja en la respuesta del servidor Eso puede llevar a los siguientes ataques: * XSS reflejado * redirección abierta * envenenamiento de caché * manipulación de encabezados -
CVE Modified by 9b29abf9-4ab0-4765-b253-1875cd9b441e
Jun. 17, 2026
Action Type Old Value New Value Added 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'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2025-40927', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2025-08-29T13:18:01.758812Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 29, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L -
New CVE Received by 9b29abf9-4ab0-4765-b253-1875cd9b441e
Aug. 29, 2025
Action Type Old Value New Value Added Description 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 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: * 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 Added CWE CWE-113 Added Reference https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-2320 Added Reference https://datatracker.ietf.org/doc/html/rfc7230#section-3 Added Reference https://metacpan.org/release/MANWAR/CGI-Simple-1.281/diff/MANWAR/CGI-Simple-1.282/lib/CGI/Simple.pm Added Reference https://metacpan.org/release/MANWAR/CGI-Simple-1.281/source/lib/CGI/Simple.pm#L1031-1035 Added Reference https://owasp.org/www-community/attacks/HTTP_Response_Splitting Added Reference https://rt.perl.org/Public/Bug/Display.html?id=21951