What is CVE-2025-2704?

CVE-2025-2704 is a high-severity vulnerability in Openvpn, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.5/10. Published 2025-04-02.

How severe is CVE-2025-2704?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Openvpn

CVE-2025-2704

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

Published 2025-04-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.008 (55.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: -0.000

Affected products

Openvpn — versions 2.6.1

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

References

community.openvpn.net/openvpn/wiki/CVE-2025-2704 (vendor-advisory, Broken Link)
www.mail-archive.com/openvpn-announce@lists.sourceforge.net/msg00142.html (release-notes)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List)

Frequently asked questions

What is CVE-2025-2704?: CVE-2025-2704 is a high-severity vulnerability in Openvpn, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.5/10. Published 2025-04-02.
How severe is CVE-2025-2704?: High severity. CVSS v3 base score is 7.5 out of 10.