CVE-2024-52919 is a vulnerability identified in Bitcoin Core prior to version 22.0, specifically within the CAddrMan component responsible for managing peer addresses. The issue arises from an integer overflow in the nIdCount variable when the node receives a large volume of addr messages. Addr messages are used in the Bitcoin protocol to share peer address information. An attacker can exploit this by flooding a vulnerable node with addr messages, causing nIdCount to overflow. This overflow triggers an assertion failure within the code, which leads to the Bitcoin daemon process exiting unexpectedly, effectively causing a denial of service (DoS). The vulnerability is classified under CWE-190 (Integer Overflow or Wraparound). The CVSS 3.1 vector indicates the attack can be performed remotely (AV:A - adjacent network), requires no privileges (PR:N), no user interaction (UI:N), and affects availability only (A:H) without impacting confidentiality or integrity. The scope remains unchanged (S:U). No patches or fixes have been officially released at the time of reporting, and no active exploitation has been observed. This vulnerability highlights the risks of resource exhaustion and stability issues in critical blockchain infrastructure components.

The primary impact of CVE-2024-52919 is denial of service against Bitcoin Core nodes, which can cause nodes to crash and disconnect from the network. This can degrade the reliability and availability of Bitcoin network participants, potentially disrupting transaction propagation and consensus processes. For organizations operating Bitcoin infrastructure, such as exchanges, wallet providers, and mining pools, this could lead to service interruptions and loss of trust. While the vulnerability does not compromise transaction integrity or user data confidentiality, repeated exploitation could reduce network resilience and increase operational costs due to downtime and recovery efforts. The attack vector requires network adjacency, so nodes exposed to untrusted peers or public networks are at higher risk. The absence of authentication and user interaction requirements makes exploitation relatively straightforward for attackers with network access.

To mitigate CVE-2024-52919, organizations should upgrade Bitcoin Core nodes to version 22.0 or later once patches are released addressing this integer overflow. Until an official patch is available, network-level controls should be implemented to limit addr message flood attempts. This includes deploying rate limiting on incoming addr messages, filtering or blocking suspicious peer connections, and isolating critical nodes behind firewalls or VPNs to restrict access to trusted peers only. Monitoring node logs for frequent assertion failures or unexpected daemon exits can help detect exploitation attempts. Additionally, running nodes with resource limits and watchdog processes to automatically restart crashed services can reduce downtime. Engaging with the Bitcoin Core community and subscribing to security advisories will ensure timely awareness of updates and fixes.