7.5High
Openvpn Openvpn
CVE-2025-13086
Improper validation of source IP addresses in OpenVPN version 2.6.0 through 2.6.15 and 2.7_alpha1 through 2.7_rc1 allows an attacker to open a session from a different IP address which did not initiate the connection resulting in a denial of service for the originating client
What this means for your business
- It affects Openvpn. It matters if your company, or a supplier that handles your data, runs it.
- An attacker can use it remotely, over a network, without a login, and without anyone at your company clicking anything.
- FIRST's prediction model gives it a 0.6% chance of attack attempts being seen in the next 30 days, ranking above 48% of all known flaws.
What to do
- 1Check whether your company or your suppliers run Openvpn, and which version. The affected versions are listed further down this page.
- 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.
Not sure if your company is exposed?
Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.
Scoring
- CVSS
- 7.5 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- CVSS v4
- 4.6
- Weakness
- CWE-940
- Assigned by
- security@openvpn.net
Dates
- Published
- 2025-12-03
- Last modified
- 2026-09-25
- Sources
- NVD
Affected products
- Openvpn Openvpn2.6.0 - 2.6.16, 2.7
As listed in the NVD configuration data. Not a statement about your estate.