CVE-2025-54870 VTun-ng's failure to initialize encryption modules may cause reversion to plaintext
Attackers can intercept plaintext traffic if encryption initialization fails, affecting users of VTun-ng virtual tunnels.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-54870?
CVE-2025-54870 is a high-severity vulnerability in leakingmemory vtun-ng, published on 5 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-636
Which versions are affected by CVE-2025-54870?
How do I fix CVE-2025-54870?
No fix has been published for CVE-2025-54870 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-54870 being exploited?
There is no known exploitation of CVE-2025-54870 in the wild and no public exploit code.
Sources
Also known as GHSA-m3jc-27c6-2wrf.