CVE-2025-15530
📋 TL;DR
This vulnerability in Open5GS allows remote attackers to trigger a reachable assertion in the SGW-C component, potentially causing denial of service. The issue affects Open5GS deployments up to version 2.7.6. Attackers can exploit this remotely without authentication.
💻 Affected Systems
- Open5GS
📦 What is this software?
Open5gs by Open5gs
⚠️ Risk & Real-World Impact
Worst Case
Remote denial of service causing SGW-C component crash and service disruption for mobile network users
Likely Case
Service disruption through component crash requiring restart
If Mitigated
No impact if patched or workarounds applied
🎯 Exploit Status
Public exploit available in GitHub issue, remote exploitation possible
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.7.7 or later
Vendor Advisory: https://github.com/open5gs/open5gs/issues/4231
Restart Required: Yes
Instructions:
1. Update Open5GS to version 2.7.7 or later
2. Restart all Open5GS services
3. Verify the fix using version check
🔧 Temporary Workarounds
Network segmentation
linuxRestrict S11 interface access to trusted network segments only
iptables -A INPUT -p tcp --dport 2123 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 2123 -j DROP
🧯 If You Can't Patch
- Implement strict network access controls to S11 interface (port 2123)
- Deploy intrusion detection systems to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check Open5GS version: open5gs --version | grep '2.7.6' or earlierCheck Version:
open5gs --versionVerify Fix Applied:
Verify version is 2.7.7 or later: open5gs --version📡 Detection & Monitoring
Log Indicators:
- SGW-C process crashes
- Assertion failures in /src/sgwc/s11-handler.c
- Unexpected S11 connection attempts
Network Indicators:
- Unusual traffic patterns to port 2123
- Malformed S11 protocol packets
SIEM Query:
process:open5gs AND (event:crash OR log_message:"assertion" OR log_message:"s11-handler.c")