CVE-2025-54604
📋 TL;DR
This vulnerability in Bitcoin Core allows attackers to cause uncontrolled resource consumption (denial of service) by exploiting a flaw in how the software handles certain network requests. All Bitcoin Core nodes running vulnerable versions are affected, potentially disrupting blockchain synchronization and network operations.
💻 Affected Systems
- Bitcoin Core
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete denial of service for Bitcoin Core nodes, preventing transaction processing and blockchain synchronization, potentially disrupting the Bitcoin network if widely exploited.
Likely Case
Degraded performance or temporary unavailability of individual Bitcoin Core nodes, causing synchronization delays and transaction processing issues.
If Mitigated
Minimal impact with proper network controls and monitoring in place to detect and block malicious traffic patterns.
🎯 Exploit Status
Exploitation requires network access to Bitcoin Core's P2P port (default 8333).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 29.1 or later
Vendor Advisory: https://bitcoincore.org/en/2025/10/24/disclose-cve-2025-54604/
Restart Required: Yes
Instructions:
1. Download Bitcoin Core 29.1 or later from https://github.com/bitcoin/bitcoin/releases
2. Stop the Bitcoin Core service
3. Install the new version
4. Restart Bitcoin Core
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict access to Bitcoin Core's P2P port (default 8333) to trusted peers only
iptables -A INPUT -p tcp --dport 8333 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 8333 -j DROP
Rate Limiting
linuxImplement network rate limiting for Bitcoin Core traffic
iptables -A INPUT -p tcp --dport 8333 -m limit --limit 50/min --limit-burst 100 -j ACCEPT
🧯 If You Can't Patch
- Implement strict network access controls to limit Bitcoin Core P2P port exposure
- Monitor system resource usage and network traffic for abnormal patterns indicating exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check Bitcoin Core version: bitcoin-cli --version or look at debug.log for version informationCheck Version:
bitcoin-cli --versionVerify Fix Applied:
Verify version is 29.1 or later and monitor for abnormal resource consumption📡 Detection & Monitoring
Log Indicators:
- Unusual high CPU/memory usage in system logs
- Excessive network connections in Bitcoin Core debug.log
Network Indicators:
- Abnormal traffic patterns on port 8333
- High volume of malformed P2P messages
SIEM Query:
source="bitcoin.log" AND ("high memory" OR "excessive connections" OR "resource exhaustion")