CVE-2024-52911: Bitcoin Core Auth Bypass Vulnerability

CVE-2024-52911 Overview

CVE-2024-52911 is a security issue affecting Bitcoin Core through version 28.x, with the earliest affected version identified as 0.14. The vulnerability is categorized under [CWE-284] Improper Access Control. Bitcoin Core developers have not publicly disclosed the technical details of the flaw at this time. The issue is exploitable over the network without authentication or user interaction. Successful exploitation impacts the confidentiality of the affected node.

Critical Impact

An unauthenticated remote attacker can exploit improper access control in Bitcoin Core nodes to compromise confidentiality without requiring privileges or user interaction.

Affected Products

• Bitcoin Core 0.14 through 28.x
• Bitcoin Core full node software
• Downstream forks and distributions based on affected Bitcoin Core releases

Discovery Timeline

• 2026-05-05 - CVE-2024-52911 published to NVD
• 2026-05-05 - Bitcoin Core publishes coordinated disclosure advisory
• 2026-05-07 - Last updated in NVD database

Technical Details for CVE-2024-52911

Vulnerability Analysis

CVE-2024-52911 is classified as an Improper Access Control weakness [CWE-284] in Bitcoin Core. Bitcoin Core is the reference implementation of the Bitcoin protocol and operates as a full node responsible for validating blocks and transactions on the peer-to-peer network. The vulnerability affects all releases from 0.14 through 28.x, spanning multiple years of Bitcoin Core development.

The technical details remain restricted under coordinated disclosure practices used by the Bitcoin Core project. Public information confirms the issue is reachable across the network and does not require credentials. Exploitation impacts confidentiality only, with no documented effect on integrity or availability of the node. The EPSS probability remains low at the time of publication, indicating no widespread exploitation activity has been observed.

For authoritative technical guidance, refer to the Bitcoin Core CVE-2024-52911 Disclosure and the Bitcoin Wiki Vulnerabilities Overview.

Root Cause

The root cause is an improper access control condition within Bitcoin Core that allows a network-based actor to access information that should be restricted. The Bitcoin Core project has not yet published the specific code paths, function names, or message types involved. Detailed technical context is expected to follow the project's standard staged disclosure once a sufficient portion of the network has upgraded.

Attack Vector

The attack vector is the network. An attacker can reach a vulnerable node over its peer-to-peer interface or other exposed services without authentication. No user interaction is required, and exploitation does not require existing privileges on the target. Operators exposing legacy Bitcoin Core releases directly to the internet face the highest exposure.

No verified proof-of-concept code is publicly available for CVE-2024-52911. Refer to the Bitcoin Core Main Site for upgrade announcements and additional technical context as it is released.

Detection Methods for CVE-2024-52911

Indicators of Compromise

• Bitcoin Core nodes running versions between 0.14 and 28.x as reported by the getnetworkinfo RPC subversion field
• Inbound peer connections from unfamiliar or short-lived IP addresses targeting the P2P port (default 8333)
• Unexpected RPC or P2P traffic patterns originating from the node logs in debug.log

Detection Strategies

• Inventory all Bitcoin Core deployments and validate their reported version against the fixed release listed in the vendor advisory
• Monitor outbound network behavior of node hosts for anomalous data transfer that could indicate confidentiality impact
• Correlate process telemetry for the bitcoind and bitcoin-qt binaries with network connection metadata at the host level

Monitoring Recommendations

• Centralize Bitcoin Core debug.log files into a SIEM and alert on repeated peer connections from the same source within short time windows
• Track P2P port exposure on perimeter firewalls and flag any node reachable from arbitrary internet sources
• Establish baselines for RPC call volume and alert on deviations that could indicate reconnaissance against a vulnerable node

How to Mitigate CVE-2024-52911

Immediate Actions Required

• Upgrade all Bitcoin Core instances to the fixed release identified in the Bitcoin Core CVE-2024-52911 Disclosure
• Restrict P2P and RPC port exposure to trusted networks only, using host firewalls or network ACLs
• Audit running node versions across operational and development environments to identify legacy 0.14 through 28.x deployments

Patch Information

Bitcoin Core has issued a coordinated disclosure for CVE-2024-52911. Operators should consult the Bitcoin Core Main Site to obtain the latest signed release and verify binaries against the published PGP signatures before deployment. The vendor advisory is the authoritative reference for the patched version range.

Workarounds

• Place nodes behind a firewall and limit inbound P2P connections to known peers using the -connect and -whitelist configuration options
• Disable unnecessary RPC interfaces and bind RPC services to 127.0.0.1 only when remote access is not required
• Avoid exposing pre-patch Bitcoin Core nodes directly to the public internet until the upgrade is applied

# Configuration example: restrict node exposure in bitcoin.conf
rpcbind=127.0.0.1
rpcallowip=127.0.0.1
bind=127.0.0.1
listen=0
maxconnections=20