VDB-318751 · CVE-2025-54870 · GHSA-m3jc-27c6-2wrf

leakingmemory vtun-ng up to 3.0.17 failing open

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.1	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic has been found in leakingmemory vtun-ng up to 3.0.17. This issue affects some unknown processing. This manipulation causes failing open. This vulnerability is handled as CVE-2025-54870. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in leakingmemory vtun-ng up to 3.0.17. It has been declared as problematic. Affected by this vulnerability is some unknown processing. The manipulation with an unknown input leads to a failing open vulnerability. The CWE definition for the vulnerability is CWE-636. When the product encounters an error condition or failure, its design requires it to fall back to a state that is less secure than other options that are available, such as selecting the weakest encryption algorithm or using the most permissive access control restrictions. As an impact it is known to affect confidentiality. The summary by CVE 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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-54870 since 07/31/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 3.0.18 eliminates this vulnerability. Applying the patch 8c63982b6c487c52db1d56ab94c266f0bc857140 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-23579). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

leakingmemory

Name

vtun-ng

Version

License

open-source

Website

Product: https://github.com/leakingmemory/vtun-ng/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Failing open
CWE: CWE-636
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: vtun-ng 3.0.18
Patch: 8c63982b6c487c52db1d56ab94c266f0bc857140

Timelineinfo

07/31/2025 CVE reserved
08/05/2025 +5 days Advisory disclosed
08/05/2025 +0 days VulDB entry created
08/05/2025 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-m3jc-27c6-2wrf
Status: Confirmed

CVE: CVE-2025-54870 (🔒)
GCVE (CVE): GCVE-0-2025-54870
GCVE (VulDB): GCVE-100-318751
EUVD: 🔒

Entryinfo

Created: 08/05/2025 09:13
Updated: 08/05/2025 18:47
Changes: 08/05/2025 09:13 (68), 08/05/2025 13:29 (1), 08/05/2025 18:47 (1)
Complete: 🔍
Cache ID: 216::103