CVE-2025-46597 Overview
CVE-2025-46597 is an integer overflow vulnerability affecting Bitcoin Core versions 0.13.0 through 29.x. This vulnerability falls under CWE-190 (Integer Overflow or Wraparound), where arithmetic operations exceed the maximum or minimum representable value for the data type, leading to unexpected behavior. The flaw can be exploited remotely without requiring authentication or user interaction, potentially causing denial of service conditions.
Critical Impact
Remote attackers can exploit this integer overflow vulnerability to cause denial of service conditions in Bitcoin Core nodes, potentially disrupting cryptocurrency network operations.
Affected Products
- Bitcoin Core versions 0.13.0 through 29.x
Discovery Timeline
- 2026-03-20 - CVE-2025-46597 published to NVD
- 2026-03-24 - Last updated in NVD database
Technical Details for CVE-2025-46597
Vulnerability Analysis
This vulnerability stems from an integer overflow condition in Bitcoin Core. Integer overflows occur when an arithmetic operation attempts to create a numeric value that exceeds the range that can be represented with a given number of bits. In the context of Bitcoin Core, this can lead to unexpected program behavior, memory corruption, or denial of service conditions.
The vulnerability is network-accessible, meaning remote attackers can trigger the overflow condition without any prior authentication or special privileges. The attack complexity is low, and no user interaction is required for successful exploitation. While the vulnerability does not directly lead to data confidentiality or integrity breaches, it can significantly impact system availability.
Root Cause
The root cause is a classic integer overflow weakness (CWE-190) where numeric calculations in the Bitcoin Core codebase can exceed the maximum representable value for the data type being used. When this overflow occurs, the value wraps around to an unexpected smaller value, potentially leading to incorrect program behavior, buffer overflows, or resource exhaustion.
Attack Vector
The attack vector is network-based, allowing remote exploitation. An attacker can craft malicious network traffic or specially crafted data that triggers the integer overflow condition. Since no authentication is required and the attack complexity is low, this vulnerability poses a significant risk to publicly accessible Bitcoin Core nodes.
The exploitation mechanism involves sending data that causes arithmetic operations to exceed integer bounds, resulting in wraparound behavior that can lead to denial of service. Detailed technical information about the specific overflow location and exploitation techniques can be found in the Bitcoin Core CVE Disclosure.
Detection Methods for CVE-2025-46597
Indicators of Compromise
- Unexpected Bitcoin Core node crashes or restarts without apparent cause
- Anomalous network traffic patterns targeting Bitcoin Core default ports (8333, 8332)
- Memory corruption errors or segmentation faults in Bitcoin Core logs
- Unusual resource consumption spikes preceding node failures
Detection Strategies
- Monitor Bitcoin Core process stability and implement crash detection alerts
- Deploy network intrusion detection systems with signatures for malformed Bitcoin protocol messages
- Implement application-level logging to capture integer overflow exceptions and arithmetic errors
- Use runtime integrity monitoring to detect unexpected memory states
Monitoring Recommendations
- Enable verbose logging on Bitcoin Core nodes to capture potential exploitation attempts
- Monitor system resource utilization for anomalies that may indicate DoS attacks
- Implement network flow analysis to detect unusual connection patterns to Bitcoin nodes
- Configure SIEM alerts for repeated node restarts or crash events
How to Mitigate CVE-2025-46597
Immediate Actions Required
- Upgrade Bitcoin Core to the latest patched version immediately
- Review and restrict network access to Bitcoin Core nodes using firewall rules
- Implement network segmentation to isolate Bitcoin infrastructure from untrusted networks
- Enable monitoring and alerting for Bitcoin Core node availability
Patch Information
Bitcoin Core has released security updates to address this vulnerability. Users should update to the latest stable release that contains the fix for CVE-2025-46597. Refer to the GitHub Bitcoin Release Notes for specific version information and upgrade instructions.
The Bitcoin Core CVE Disclosure provides official guidance from the development team regarding this vulnerability and recommended remediation steps.
Workarounds
- Restrict network access to Bitcoin Core nodes by implementing firewall rules that limit connections to trusted IP addresses only
- Deploy Bitcoin Core behind a reverse proxy or load balancer with rate limiting capabilities
- Consider temporarily isolating affected nodes from the public network until patches can be applied
- Implement connection limits to reduce the potential impact of exploitation attempts
# Example firewall configuration to restrict Bitcoin Core access
# Allow only trusted IPs to connect to Bitcoin Core ports
iptables -A INPUT -p tcp --dport 8333 -s trusted_ip_range -j ACCEPT
iptables -A INPUT -p tcp --dport 8333 -j DROP
iptables -A INPUT -p tcp --dport 8332 -s trusted_ip_range -j ACCEPT
iptables -A INPUT -p tcp --dport 8332 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
