Vulnerability details

CVE-2025-54870

leakingmemory vtun-ng

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

CVSS 4.0

8.7High

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.

CVSS scores

Score	Version	Source	Vector
8.7High	4.0	CVEProject cvelistV5 (CNA) (GitHub_M)	`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`

Affected products

Vendor	Product	Versions	Source
leakingmemory	vtun-ng	>= 3.0.12, < 3.0.18	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/leakingmemory/vtun-ng/security/advisories/GHSA-m3jc-27c6-2wrf x_refsource_CONFIRM
https://github.com/leakingmemory/vtun-ng/commit/8c63982b6c487c52db1d56ab94c266f0bc857140 x_refsource_MISC

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Details

Published: 2025-08-05
Last updated: 2025-08-05
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.22%

Probability of exploitation in 30 days

13.5%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-636
Not Failing Securely ('Failing Open')