How to fix CVE-2025-3840?

During next maintenance window: Apply vendor patches when convenient. Verify cross-site scripting controls are in place.

CVE-2025-3840

LOW

Cross-site Scripting (XSS) (CWE-79)

2025-04-21 bd8dbf88-98d9-42c6-be08-cf8e48a32093

XSS

2.1

CVSS 4.0

CVSS VectorNVD

CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

Scope

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:38 vuln.today

CVE Published

Apr 21, 2025 - 10:15 nvd

LOW 2.1

DescriptionNVD

An improper neutralization of input vulnerability was identified in the End of Life (EOL) OVA based connect installer component which is deployed for installation purposes in a customer network. This EOL component was deprecated in September 2023 with end of support extended till January 2024. An actor can manipulate the action parameter of the login form to inject malicious scripts which would lead to a XSS attack under certain conditions.

AnalysisAI

An improper neutralization of input vulnerability was identified in the End of Life (EOL) OVA based connect installer component which is deployed for installation purposes in a customer network. Rated low severity (CVSS 2.1), this vulnerability is no authentication required, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. An improper neutralization of input vulnerability was identified in the End of Life (EOL) OVA based connect installer component which is deployed for installation purposes in a customer network. This EOL component was deprecated in September 2023 with end of support extended till January 2024. An actor can manipulate the action parameter of the login form to inject malicious scripts which would lead to a XSS attack under certain conditions.

Affected ProductsAI

See vendor advisory for affected versions.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

CVE-2025-3840 vulnerability details – vuln.today

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