Vulnerability in Openvpn Access Server
CVE-2025-3110
OpenVPN Access Server 2.7.2 through 3.1.0 accepts bare line-feed sequences inside HTTP header values, allowing remote attackers to perform HTTP request smuggling when deployed behind a reverse proxy
Vulnerability class: HTTP Request Smuggling
EPSS: 0.003 (17.9th percentile) — read the EPSS interpretation.
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:H/A:N.
Affected products
- Openvpn Access Server — versions 2.7.2
- Openvpn Openvpn_access_server
Weakness classification (CWE)
References
- security@openvpn.net (release-notes, Release Notes)
Frequently asked questions
- What is CVE-2025-3110?
- CVE-2025-3110 is a high-severity vulnerability in Openvpn Access Server, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.5/10. Published 2026-07-08.
- How severe is CVE-2025-3110?
- High severity. CVSS v3 base score is 7.5 out of 10.