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CVE-2025-20240 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CNA: [email protected]CVSS-B:6.1 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webui-xss-VWyDgjOU	[email protected]	AdvisoryRemedyVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-692	Incomplete Denylist to Cross-Site Scripting	[email protected]

Affected Products

Product	Versions
Cisco IOS XE Software	All versions
CPE cpe:2.3:a:cisco:ios_xe:::::::: cpe:2.3:o:cisco:ios_xe:::::::: Remediation Workaround:low effort Disable the HTTP Server feature by executing the "no ip http server" and "no ip http secure-server" commands in global configuration mode. Both commands are required if both the HTTP server and HTTPS server are in use. Mitigation:low effort Allow only trusted networks to access the HTTP server. For example, to allow remote access to the HTTP server from the trusted 192.168.10.0/24 network, execute the following commands: ip http access-class ipv4 restrict_ipv4_webui ip access-list standard restrict_ipv4_webui permit 192.168.10.0 0.0.0.255

Product

Versions

Cisco IOS XE Software

All versions

CPE

cpe:2.3:a:cisco:ios_xe:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*

Remediation

Workaround:low effort
Disable the HTTP Server feature by executing the "no ip http server" and "no ip http secure-server" commands in global configuration mode. Both commands are required if both the HTTP server and HTTPS server are in use.
Mitigation:low effort
Allow only trusted networks to access the HTTP server. For example, to allow remote access to the HTTP server from the trusted 192.168.10.0/24 network, execute the following commands: ip http access-class ipv4 restrict_ipv4_webui ip access-list standard restrict_ipv4_webui permit 192.168.10.0 0.0.0.255

Change History

5 change records found show changes

Date	Action	Recorded By
Sep 26, 2026	CVE Translated	[email protected]
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Sep 26, 2025	CVE Modified	[email protected]
Sep 24, 2025	New CVE Received	[email protected]