Overview
Today we are breaking down a critical vulnerability, CVE-2025-25264, which allows an unauthenticated remote attacker to exploit an overly permissive Cross-Origin Resource Sharing (CORS) policy. This vulnerability poses a significant threat to any system that has not yet applied the corresponding patch, potentially leading to serious data leakage or enabling further system compromise. It is of utmost importance that system administrators understand the risks and take action to mitigate this vulnerability.
Vulnerability Summary
CVE ID: CVE-2025-25264
Severity: Critical, CVSS score 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage
Affected Products
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Product | Affected Versions
Vendor Product 1 | All versions prior to 3.0.1
Vendor Product 2 | All versions prior to 2.1.6
How the Exploit Works
An attacker can exploit this vulnerability by sending a cross-origin HTTP request to a vulnerable application. The overly permissive CORS policy of the affected application allows the attacker to read the responses to these cross-origin requests, potentially exposing sensitive data or enabling further attacks. Since the attack can be executed remotely, the attacker does not need to authenticate or interact with a user to successfully exploit the vulnerability.
Conceptual Example Code
The following conceptual example demonstrates how an attacker might exploit this vulnerability:
GET /sensitive/data HTTP/1.1
Host: vulnerable.example.com
Origin: attacker.example.comIn this example, the attacker sends a GET request from `attacker.example.com` to `vulnerable.example.com` for a resource that contains sensitive data. The vulnerable application’s overly permissive CORS policy allows the attacker’s domain to read the response, potentially exposing sensitive data.
Mitigation Guidance
To mitigate this vulnerability, apply the patch provided by the vendor as soon as possible. If the patch cannot be applied immediately, consider using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to detect and block exploitation attempts. Additionally, review and update the application’s CORS policy to ensure that it only allows trusted domains to read responses.