# CVE-2025-54870

## Summary

- **CVE ID:** CVE-2025-54870
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-636
- **Published:** Aug 5, 2025
- **Last Modified:** Mar 12, 2026

## Description

VTun-ng is a Virtual Tunnel over TCP/IP network. In versions 3.0.17 and below, failure to initialize encryption modules might cause reversion to plaintext due to insufficient error handling. The bug was first introduced in VTun-ng version 3.0.12. This is fixed in version 3.0.18. To workaround this issue, avoid blowfish-256.

## Affected Products

- leakingmemory — vtun-ng (>= 3.0.12, < 3.0.18)

## References

- [CNA](https://github.com/leakingmemory/vtun-ng/security/advisories/GHSA-m3jc-27c6-2wrf)
- [CNA](https://github.com/leakingmemory/vtun-ng/commit/8c63982b6c487c52db1d56ab94c266f0bc857140)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.20%
- **EPSS Percentile:** 9.8

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