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Vulnerabilities

Security fix · CVE-2025-54870

VTun-ng is a Virtual Tunnel over TCP/IP network.

Published Aug 5, 2025 · catalog updated Aug 5, 2025 · VTun-ng is a Virtual

Last checked Oct 26, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-54870. EPSS is 0.21%. Act only if a listed version of VTun-ng is a Virtual is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (VTun-ng is a Virtual).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.21%
Remediation
Version ranges on file
Affected products
vendor leakingmemory vtun-ng 3.0.12, < 3.0.18

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor leakingmemory vtun-ng 3.0.12, < 3.0.183.0.12, < 3.0.18

How to fix CVE-2025-54870

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-54870. EPSS is 0.21%. Act only if a listed version of VTun-ng is a Virtual is installed.

Which versions are affected?

Compare what you have installed with leakingmemory vtun-ng 3.0.12, < 3.0.18 3.0.12, < 3.0.18. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.21%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 5, 2025 · EUVD

    Detected

    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.

  2. Aug 5, 2025 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2025-54870

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-54870

    30-day exploitation probability 0.21%

    first.org
  • EUVDVulnerability recordEUVD-2025-23579

    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.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 26, 2026
  • CVE.orgOct 21, 2026
  • EUVDOct 20, 2026