CVE-2025-54870: Leakingmemory Vtun-NG

High severity, CVSS 8.7. EPSS: 0.2% chance of exploitation in the next 30 days.

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: from 3.0.12, before 3.0.18 (fixed in 3.0.18)

Published 2025-08-05. Last modified 2026-06-17.