CVE-2025-41083
📋 TL;DR
CVE-2025-41083 is a host header injection vulnerability in Altitude Authentication Service and Altitude Communication Server that allows attackers to manipulate HTTP requests to redirect victims to malicious websites. This can trick users into submitting login credentials to attacker-controlled endpoints. Organizations using affected versions of these Altitude products are at risk.
💻 Affected Systems
- Altitude Authentication Service
- Altitude Communication Server
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal legitimate user credentials through phishing-style redirections, potentially leading to full account compromise and unauthorized access to sensitive systems.
Likely Case
Credential harvesting attacks targeting users of the affected authentication and communication services, potentially leading to account takeover.
If Mitigated
Limited impact with proper network segmentation, user awareness training, and monitoring for suspicious redirects.
🎯 Exploit Status
Attack requires ability to send crafted HTTP requests to vulnerable endpoints and social engineering to trick users.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in available information
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-altitude-communication-server
Restart Required: No
Instructions:
1. Monitor vendor for security updates. 2. Apply patches when available. 3. Test in non-production environment first.
🔧 Temporary Workarounds
Host Header Validation
allImplement strict validation of Host headers at web server or application firewall level
Network Segmentation
allRestrict access to affected services to trusted networks only
🧯 If You Can't Patch
- Implement web application firewall rules to block malicious Host header manipulation
- Deploy network monitoring to detect suspicious redirect patterns
🔍 How to Verify
Check if Vulnerable:
Test by sending HTTP requests with manipulated Host headers to the affected services and observing if redirections occurCheck Version:
Check application version through administrative interface or configuration filesVerify Fix Applied:
Retest with manipulated Host headers after applying mitigations to confirm redirections are blocked📡 Detection & Monitoring
Log Indicators:
- Unusual Host header values in HTTP logs
- Unexpected redirect patterns in application logs
Network Indicators:
- HTTP requests with manipulated Host headers
- Redirects to external or unexpected domains
SIEM Query:
http.host:*malicious* OR http.location:*external*