CVE-2025-52919
📋 TL;DR
This vulnerability in Yealink RPS (Remote Provisioning Service) allows attackers to upload invalid certificates due to insufficient content validation. Affects organizations using Yealink VoIP phones with RPS before May 26, 2025. The flaw could enable man-in-the-middle attacks or service disruption.
💻 Affected Systems
- Yealink RPS (Remote Provisioning Service)
⚠️ 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 could upload malicious certificates enabling man-in-the-middle attacks, intercepting sensitive VoIP communications, or disrupting phone provisioning services.
Likely Case
Unauthorized certificate upload leading to service disruption or degraded security posture of VoIP infrastructure.
If Mitigated
Limited impact with proper network segmentation and certificate management controls in place.
🎯 Exploit Status
Exploitation requires access to certificate upload functionality. No public exploit code identified at time of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: RPS version from 2025-05-26 onward
Vendor Advisory: https://www.yealink.com/en/trust-center/security-advisories/ecb16a4993014d22
Restart Required: Yes
Instructions:
1. Access Yealink RPS administration interface
2. Check current version
3. If before 2025-05-26, update to latest version
4. Restart RPS service
5. Verify certificate validation is functioning
🔧 Temporary Workarounds
Disable certificate upload functionality
allTemporarily disable certificate upload feature in RPS until patched
Network segmentation
allRestrict access to RPS certificate upload endpoints
🧯 If You Can't Patch
- Implement strict network access controls to RPS certificate upload endpoints
- Monitor certificate upload logs for suspicious activity and implement alerting
🔍 How to Verify
Check if Vulnerable:
Check RPS version in administration interface. If version date is before 2025-05-26, system is vulnerable.Check Version:
Check via Yealink RPS web interface or administrative consoleVerify Fix Applied:
Verify RPS version shows 2025-05-26 or later. Test certificate upload with invalid certificate to confirm rejection.📡 Detection & Monitoring
Log Indicators:
- Multiple failed certificate upload attempts
- Certificate uploads from unusual IP addresses
- Invalid certificate format uploads
Network Indicators:
- Unusual traffic to RPS certificate upload endpoints
- Certificate uploads outside normal business hours
SIEM Query:
source="yealink-rps" AND (event="certificate_upload" OR event="cert_upload")