CVE-2025-0430
📋 TL;DR
CVE-2025-0430 is a NULL pointer dereference vulnerability in Belledonne Communications Linphone-Desktop that allows remote attackers to cause denial-of-service by crashing the application. This affects all users running vulnerable versions of Linphone-Desktop, a popular open-source SIP client for VoIP communications.
💻 Affected Systems
- Belledonne Communications Linphone-Desktop
⚠️ 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
Remote attacker crashes Linphone-Desktop application, disrupting VoIP communications and potentially causing service interruption for all users of the affected system.
Likely Case
Application crashes when processing malicious SIP messages, requiring manual restart and causing temporary communication disruption.
If Mitigated
With proper network segmentation and firewall rules, only authenticated users could trigger the crash, limiting exposure.
🎯 Exploit Status
Exploitation requires sending specially crafted SIP messages to the vulnerable application. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.2.0 and later
Vendor Advisory: https://www.linphone.org/news/security-advisories
Restart Required: Yes
Instructions:
1. Download Linphone-Desktop version 5.2.0 or later from official website. 2. Install the update following standard installation procedures. 3. Restart the Linphone application to apply the fix.
🔧 Temporary Workarounds
Network Segmentation
allRestrict SIP traffic to trusted sources only using firewall rules
Session Border Controller Protection
allDeploy SBC to filter and sanitize SIP traffic before reaching Linphone
🧯 If You Can't Patch
- Implement strict firewall rules to allow SIP traffic only from trusted sources
- Monitor application logs for crash events and implement automated restart procedures
🔍 How to Verify
Check if Vulnerable:
Check Linphone version via Help → About menu. If version is below 5.2.0, the system is vulnerable.Check Version:
linphone --version (Linux/macOS) or check About dialog in GUIVerify Fix Applied:
Verify version is 5.2.0 or higher in Help → About menu and test SIP functionality remains operational.📡 Detection & Monitoring
Log Indicators:
- Application crash logs
- SIP protocol parsing errors
- Unexpected termination events
Network Indicators:
- Unusual SIP message patterns
- Malformed SIP packets from untrusted sources
SIEM Query:
source="linphone" AND (event="crash" OR event="segfault" OR message="NULL pointer")