CVE-2025-20240

A vulnerability in the Web Authentication feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct a reflected cross-site scripting attack (XSS) on an affected device. This vulnerability is due to improper sanitization of user-supplied input. An attacker could exploit this vulnerability by persuading a user to click a malicious link. A successful exploit could allow the attacker to execute a reflected XSS attack and steal user cookies from the affected device.

CVSS v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webui-xss-VWyDgjOU

Configurations

No configuration.

History

26 Sep 2026, 00:10

Type	Values Removed	Values Added
Summary		(es) Una vulnerabilidad en la característica de autenticación web de Cisco IOS XE Software podría permitir a un atacante remoto no autenticado llevar a cabo un ataque de cross-site scripting (XSS) reflejado en un dispositivo afectado. Esta vulnerabilidad se debe a una sanitización inadecuada de la entrada proporcionada por el usuario. Un atacante podría explotar esta vulnerabilidad persuadiendo a un usuario para que haga clic en un enlace malicioso. Un exploit exitoso podría permitir al atacante ejecutar un ataque de XSS reflejado y robar las cookies del usuario del dispositivo afectado.

Information

Published : 2025-09-24 18:15

Updated : 2026-09-26 00:10

NVD link : CVE-2025-20240

Mitre link : CVE-2025-20240

CVE.ORG link : CVE-2025-20240

JSON object : View

Products Affected

No product.

CWE

CWE-692

Incomplete Denylist to Cross-Site Scripting

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"2025-09-24T18:15:34.333", "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webui-xss-VWyDgjOU", "source": "psirt@cisco.com"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "psirt@cisco.com", "description": [{"lang": "en", "value": "CWE-692"}]}], "descriptions": [{"lang": "en", "value": "A vulnerability in the Web Authentication feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct a reflected cross-site scripting attack (XSS) on an affected device.\r\n\r This vulnerability is due to improper sanitization of user-supplied input. An attacker could exploit this vulnerability by persuading a user to click a malicious link. A successful exploit could allow the attacker to execute a reflected XSS attack and steal user cookies from the affected device."}, {"lang": "es", "value": "Una vulnerabilidad en la caracter\u00edstica de autenticaci\u00f3n web de Cisco IOS XE Software podr\u00eda permitir a un atacante remoto no autenticado llevar a cabo un ataque de cross-site scripting (XSS) reflejado en un dispositivo afectado. Esta vulnerabilidad se debe a una sanitizaci\u00f3n inadecuada de la entrada proporcionada por el usuario. Un atacante podr\u00eda explotar esta vulnerabilidad persuadiendo a un usuario para que haga clic en un enlace malicioso. Un exploit exitoso podr\u00eda permitir al atacante ejecutar un ataque de XSS reflejado y robar las cookies del usuario del dispositivo afectado."}], "lastModified": "2026-09-26T00:10:00.127", "sourceIdentifier": "psirt@cisco.com"}