What’s Vulnerable › Vulnerabilities

CVE-2023-33297

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-05-22 · updated 2026-06-17
• Weakness: CWE-400

Description

Bitcoin Core before 24.1, when debug mode is not used, allows attackers to cause a denial of service (e.g., CPU consumption) because draining the inventory-to-send queue is inefficient, as exploited in the wild in May 2023.

Affected products

• Bitcoin Core: before 24.1 — fixed in 24.1

How to fix

Upgrade to a fixed version: Bitcoin Core 24.1. Check the vendor advisory for mitigations.

References

• https://en.bitcoin.it/wiki/Common_Vulnerabilities_and_Exposures
• https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-24.1.md
• https://github.com/bitcoin/bitcoin/issues/27586
• https://github.com/bitcoin/bitcoin/issues/27623
• https://github.com/bitcoin/bitcoin/pull/27610
• https://github.com/dogecoin/dogecoin/issues/3243#issuecomment-1712575544
• https://github.com/visualbasic6/drain
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F2EI7SAP4QP2AJYK2JVEOO4GJ6DOBSM5/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H3CQY277NWXY3RFCZCJ4VKT2P3ROACEJ/
• https://x.com/123456/status/1711601593399828530
• https://en.bitcoin.it/wiki/Common_Vulnerabilities_and_Exposures
• https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-24.1.md

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