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How the CVE Works
CVE-2025-20216 exploits improper input sanitization in Cisco Catalyst SD-WAN Manager’s web interface. An attacker crafts a malicious link containing HTML payloads. When an authenticated user clicks the link, the payload executes in their browser due to insufficient filtering. This allows arbitrary HTML/JavaScript injection, potentially leading to session hijacking, phishing, or data theft. The attack relies on social engineering to trick users into interacting with the malicious link.
DailyCVE Form
Platform: Cisco Catalyst SD-WAN Manager
Version: Prior to 20.12.1
Vulnerability: HTML Injection
Severity: Medium
Date: 05/07/2025
Prediction: Patch expected by 09/2025
What Undercode Say
Check vulnerable version show version | include SD-WAN Exploit simulation (PoC) curl -X GET "http://target/api/insecure?input=<script>alert(1)</script>" Mitigation verification grep "input_sanitization" /etc/web-config.conf
How Exploit
1. Attacker crafts malicious URL:
`http://target/dashboard?user=`
2. Sends link via phishing email.
3. Authenticated user clicks, executing payload.
Protection from this CVE
- Apply Cisco patch 20.12.1+.
- Enable CSP headers.
- Filter user input server-side.
Impact
- Session hijacking.
- Phishing attacks.
- Data exfiltration.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
