OpenVPN up to 2.6.13 Server Mode unusual condition

CVSS Meta Temp Score
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Current Exploit Price (≈)
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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.
3.7$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in OpenVPN up to 2.6.13. This issue affects some unknown processing of the component Server Mode. Performing a manipulation results in unusual condition. This vulnerability is reported as CVE-2025-2704. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, was found in OpenVPN up to 2.6.13. This affects an unknown functionality of the component Server Mode. The manipulation with an unknown input leads to a unusual condition vulnerability. CWE is classifying the issue as CWE-754. The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product. This is going to have an impact on availability. The summary by CVE is:

OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to trigger a denial of service by corrupting and replaying network packets in the early handshake phase

It is possible to read the advisory at community.openvpn.net. This vulnerability is uniquely identified as CVE-2025-2704 since 03/24/2025. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/24/2025).

The vulnerability scanner Nessus provides a plugin with the ID 233986 (Fedora 41 : openvpn (2025-277b5e1d96)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (233986). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Unusual condition
CWE: CWE-754
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 233986
Nessus Name: Fedora 41 : openvpn (2025-277b5e1d96)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

03/24/2025 🔍
04/03/2025 +9 days 🔍
04/03/2025 +0 days 🔍
05/24/2025 +51 days 🔍

Sourcesinfo

Advisory: community.openvpn.net
Status: Confirmed

CVE: CVE-2025-2704 (🔍)
GCVE (CVE): GCVE-0-2025-2704
GCVE (VulDB): GCVE-100-303087

Entryinfo

Created: 04/03/2025 07:36
Updated: 05/24/2025 04:48
Changes: 04/03/2025 07:36 (52), 04/08/2025 16:02 (2), 05/24/2025 04:48 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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