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How the CVE Works
The vulnerability in the `private-ip` package arises due to insufficient validation of user-supplied IP addresses or hostnames. The package fails to restrict multicast IP ranges (224.0.0.0/4), allowing attackers to bypass internal IP checks. When a malicious actor provides a specially crafted multicast address, the package incorrectly treats it as a valid private IP, enabling SSRF attacks. This can lead to unauthorized internal network requests, data exposure, or internal service abuse. The exploit leverages the package’s incomplete IP range validation logic, making it possible to interact with restricted multicast services.
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Platform: Node.js
Version: All
Vulnerability: SSRF
Severity: High
Date: Jul 23, 2025
Prediction: Patch by Aug 10, 2025
What Undercode Say
npm audit --production curl -X GET "http://vulnerable-server/?ip=224.0.0.1"
How Exploit
- Attacker sends a crafted request with a multicast IP.
2. `private-ip` fails to block the request.
3. Server processes the malicious internal call.
Protection from this CVE
- Update `private-ip` to patched version.
- Implement strict IP validation.
- Restrict outbound requests.
Impact
- Unauthorized internal access.
- Data leakage.
- Network service abuse.
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
