# CVE-2025-58359

## Summary

- **CVE ID:** CVE-2025-58359
- **Severity:** MEDIUM
- **CVSS Score:** 6 (CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-325
- **Published:** Sep 4, 2025
- **Last Modified:** Mar 13, 2026

## Description

ZF FROST is a Rust implementation of FROST (Flexible Round-Optimised Schnorr Threshold signatures). In versions 2.0.0 through 2.1.0, refresh shares with smaller min_signers will reduce security of group. The inability to change min_signers (i.e. the threshold) with the refresh share functionality (frost_core::keys::refresh module) was not made clear to users. Using a smaller value would not decrease the threshold, and attempts to sign using a smaller threshold would fail. Additionally, after refreshing the shares with a smaller threshold, it would still be possible to sign with the original threshold, potentially causing a security loss to the participant's shares. This issue is fixed in version 2.2.0.

## Affected Products

- ZcashFoundation — frost (>= 2.0.0, < 2.2.0)

## References

- [CNA](https://github.com/ZcashFoundation/frost/security/advisories/GHSA-wgq8-vr6r-mqxm)
- [CNA](https://github.com/ZcashFoundation/frost/commit/379ef689c733b3d9c80fd409071d4f3af4dafed2)
- [CNA](https://github.com/ZcashFoundation/frost/releases/tag/frost-core%2Fv2.2.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.29%
- **EPSS Percentile:** 21.0

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._