CVE-2025-54870CWE-636

VTun-ng's failure to initialize encryption modules may cause reversion to plaintext

High · published August 5, 2025

CVSS v4.0
8.7
EPSS
0%
Percentile
9.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.7 · HIGH
Vector
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
EPSS
0.00199 · 9.3th percentile
Weakness
CWE-636 · Not Failing Securely ('Failing Open')
Published
2025-08-05T00:02Z
EPSS history
Timeline
  • 05 AUG 00:02Z
    VTun-ng's failure to initialize encryption modules may cause reversion to plaintext
    cvelistv5