# CVE-2015-6964

## Summary

- **CVE ID:** CVE-2015-6964
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
- **CWE:** N/A
- **Published:** Sep 25, 2023
- **Last Modified:** Sep 17, 2026

## Description

MultiBit HD before 0.1.2 allows attackers to conduct bit-flipping attacks that insert unspendable Bitcoin addresses into the list that MultiBit uses to send fees to the developers. (Attackers cannot realistically steal these fees for themselves.) This occurs because there is no message authentication code (MAC).

## Affected Products

- n/a — n/a (n/a)

## References

- [CNA](https://web.archive.org/web/20160506095434/https://multibit.org/blog/2015/07/25/bit-flipping-attack.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.09%
- **EPSS Percentile:** 25.6

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._